The Best Hgs Molecular Model Kit of 2023 – Reviewed and Top Rated

2,840 Reviews Scanned

Rank No. #1

HGS Molecular Structure Model Kit: Organic Chemistry : With Instruction Manual

Model Kit, Instruction Manual, Molecular Structure
Arlyn M. Myers (Author)
English (Publication Language)
27 Pages - 07/12/2024 (Publication Date) - W H Freeman & Co (Publisher)

Rank No. #2

HGS Molecular Model (Essentials of General, Organic and Biochemistry - Model Kit)

Maruzen (Publisher)

SaleRank No. #3

LINKTOR Chemistry Molecular Model Kit (444 Pieces), Student or Teacher Set for Organic and Inorganic Chemistry Learning, Motivate Enthusiasm for Learning and Raising Space Imagination, A Fullerene Set

FOR BASIC TEACHING TO ADVANCED SCIENCE: 444 pieces molecular model kit, including 136 atoms, 158 bonds and 150 parts for Carbon-60(Fullerene), provides to students from Grade 7 to Graduate level.
TWO CHEMICAL STRUCTURE MODELS: The ball-and-stick models use spheres to represent atoms and sticks to represent chemical bonds. In the space-filling model, the spheres are drawn to scale and are next to one another as atoms are in real molecules.
CHEMISTRY EDUCATIONAL MOLECULE MODEL IN 3D: It can display chemical structure, molecular bond, and bond angle in all directions. Demonstrate fundamental molecular geometry, chemical molecular structure, stereochemistry with 3D modeling studies.
EASY TO LEARN: The universal standard adopted for each atom's color makes it easier for you to use and learn. Atoms and chemical bonds combine tightly and firmly and can be easily disassembled by disconnecting tools.
If you’re not in love with it for whatever reason, we’ll give you a full replacement or refund—no questions asked. If you have any doubt, please tell us. With nothing to worry about, or even to share with your friends, try it now.

SaleRank No. #4

OLD NOBBY Organic Chemistry Model Kit (239 pc) - Molecular Models Kit with Atoms, Bonds, Instructions - Molecular Model Kit Organic Chemistry, Molecule Kit, STEM Science Kits for Kids, Chemistry Set

MOLECULAR MODEL KIT - This educational molecule modeling kit is designed for easy chemistry learning for organic, inorganic and, functional groups. The molecular model kit organic chemistry caters to both beginners and advanced science and chemistry learning. Develop, architect, and unleash your chemistry genius.
BONUS LEARNING GUIDE AND MOLECULE STENCIL - This model molecule kit for organic chemistry comes with an 8-page instructional guide to easily identify all atoms and connectors as well as a molecule stencil for drawing structures on paper. Delivered in a sturdy plastic box with four compartments for storage and portability, it's a complete toolkit to help learn organic chemistry.
3D VISUAL LEARNING - The 239-piece molecule model kit is built for students from Grade 7 to graduate level, with color-coded bonds to help visually understand and demonstrate the structure and geometry of compounds. All atoms are color-coded to universal standards, making the Old Nobby molecular kit your best chemistry friend.
ASSEMBLE COMPLEX STRUCTURES IN MINUTES - The organic chemistry molecular model kit contains high-quality atoms and bonds that seamlessly connect and disconnect to ensure you don't get tired fingers. Bonus link remover is also included to make the task of dissembling your molecular atom model kit structures super easy and fast.
FUN AND EFFECTIVE WAY TO LEARN CHEMISTRY - Learning complex structures in 3D with color-coded atoms, plus your bonus learning guide, means the organic chemistry kit is designed to serve your chemistry needs for years to come. A great chemistry set for students, ochem teachers, young scientists, and alike!

Rank No. #5

125-Piece Molecular Model Kit, Inorganic and Organic Chemistry Scientific Atom Molecular Models, Color-Coded Chemistry Set of Atoms and Molecules for Kids, STEM Set w/Carrying Case - Atomic Architect

125-Piece Molecular Model Kit for General and Organic Chemistry - Create your own 3D Atom Model with Atomic Architect’s chemistry model kits. This adult and kids chemistry set makes advanced science learning a breeze. Use it to make organic structures, cyclic compounds, and biology models.
A Supplementary Tool for Highly Effective Learning - Our organic chemistry model kit includes 54 atoms, 70 bonds, and a disconnector tool. The molecular set is color-coded to national standards for easy identification. It allows high school up to graduate school students to build an atomic structure model and visually demonstrate molecular geometry, the structure of compounds, and other bond types.
A Fun, Interactive Way to Learn Chem - Learning is more stimulating when you have a molecule model in 3D! Our 125-piece chemistry model kit with atom centers, bonds, and orbitals helps you understand chemistry concepts like inorganic molecules, general empirical formula representations, and organic structures.
Easy Transport and Storage - Take your chemistry molecular set from home to school and anywhere else. Each organic molecular model kit includes a premium-quality, travel-friendly case, which can also hold your textbooks, notebooks, and other supplies.
Excellent Science Gifts for Learners and Educators - Be an Atomic Architect with the most convenient chemistry model kit you’ll ever use. Our atoms kit is a thoughtful educational present for yourself, your friends, classmates, and your loved ones.

Rank No. #6

Swpeet 122 Pcs Organic Chemistry Molecular Model Student and Teacher Kit, Molecular Model Set for Inorganic & Organic Chemistry - 59 Atoms & 62 Links & 1 Short Link Remover Tool

★ ADVANCED LEARNING SCIENCE EDUCATION KIT --- Perfect chemistry model kit for modeling simple and small to more advanced and complex chemical structures for schools and college level, students of all ages, researchers and enthusiasts. Fun and interactive early learning molecular set for kids of all years and for use in the classroom.
★ HIGH QUALITY --- Made from high quality durable materials designed for easy construction and perfect fit. These Molecular Model Kit pieces are color coded to national standards for easy ID. Organic Chemistry Model Kit includes box for easy storage and transport with your other textbooks, notes, and books. Excellent for the classroom.
★ POWERFUL FUNCTIONS --- This Molecular Model Kit has a total of 122 pieces including short link remover tool. Super easy to build models for organic and inorganic chemistry, This model contains C, H, O, N, S and a variety of single and double bonds, Can be put high school, university chemi stry in most of the organic or inorganic molecular structure model for the study of experimental operation.
★ QUICK AND EASY ASSEMBLY OF COMPLEX STRUCTURES --- Atoms and bonds that are perfectly suited to being connected and disconnected easily without making your fingers hurt. We've also included a link remover to make the task of easy.
★ CONVENIENT STORAGE --- The pieces come in a slim plastic box for convenient storage. See the pictures on this listing for a full understanding of what's inside!

Rank No. #7

JoyCat Molecular Model Kit (404 pcs), Organic Chemistry Molecule Science Gifts for Ochem and Inorganic Students and Teachers

🔓 UNLOCK YOUR CHEMISTRY POTENTIAL: Our comprehensive molecular model kit includes 404 pieces, featuring 100 atoms, 153 bonds, 60 mini C60 atoms, 90 mini C60 bonds, and a remover tool. Suitable for chemistry learners from beginners to advanced levels. Manufacturer recommended age: 15 years and up.
🗃️ ORGANIZED STORAGE AND EASY LOCATING: Experience hassle-free organization with our storage box, complete with divided compartments and labeled sections. Say goodbye to clutter and quickly find the components you need.
📚 EXTRA LEARNING MATERIALS FOR EXCELLENCE: Enhance your studies with our bonus 6-page learning guide and stencils. From grade 9 to college, from organic to inorganic, finish and master your assignments faster and create numerous molecular structures with ease.
🟢 IMMERSIVE 3D VISUAL LEARNING: Explore chemistry in a captivating way with our 3D visual learning approach. The universal color-coded Atomic Balls provide a better understanding of molecular structure, boosting your chemistry knowledge. It's also a perfect gift for someone who are going to learn those complex molecule.
🔧 USER-FRIENDLY DESIGN: Crafted from smooth, burr-free plastic, our molecular science kit ensures easy assembly. With the included remover tool, disassembling is a breeze. Contact us anytime if you have any questions with this molecular set and we will support you within 24 hours.

Rank No. #8

Swpeet 125 Pcs Molecular Model Kit for Inorganic & Organic Molecular Model Teacher and 16 Years and Over Student Kit - 54 Atoms & 70 Links & 1 Short Link Remover Tool - Science Toys

★ BASIC TO ADVANCED LEARNING --- Perfect for 16 years and over student, whoever you are senior student or college student(16 Years and Over). Fantastic learning aid for your. If you have had one at home you can practice with your family. Meanwhile if you are student to playing with it by yourself to brush up on defunct chemistry skills. The pieces all to be sturdy and well made, and can use it for years to come.
★ FALL IN LOVE WITH CHEMISTRY --- These are so much fun to play with and they help you understand the relationship between molecules. Let you learn the shapes and chemical makeup of all the functions groups you'v so far learned in O-Chem and Inorganic chemistry.
★ HIGH QUALITY --- Made from high quality durable materials designed for easy construction and perfect fit. These molecular model kit pieces are color coded to national standards for easy ID. Organic chemistry model kit includes box for easy storage and transport with your other textbooks, notes, and books. Excellent for the classroom.
★ MOLECULE SCIENCE IN 3D --- We have prepared 125 Pcs molecular model set for you, This model contains C, H, O, N, P, S, Halogen, and other metals and a variety of single and double bonds, long bonds, long keys. Can be put high school, university chemistry in most of the organic or inorganic molecular structure model for the study of experimental operation.
★ CONVENIENT STORAGE --- The pieces come in a slim plastic box for convenient storage. See the pictures on this listing for a full understanding of what's inside!

Rank No. #9

HGS Polyhedron Molecular Model 1013Alpha Organic Chemistry Set for Student <3rd Edition>

HGS Maruzen (Author)
English (Publication Language)
07/12/2024 (Publication Date) - HGS Maruzen (Publisher)

Rank No. #10

Mererke Advanced Organic and Inorganic Chemistry, Molecular Model Teaceher &Student Set Kit 240PCS(XMM-066)

QUALIFIED CHEMISTRY ASSISTANT - This 240-piece molecular model kit is the best assistant to help you learn chemistry. If you are new to chemistry and do not have a solid foundation of chemistry knowledge, this molecular model kit will be a mentor to help you easily understand the complex 3-D molecular structures. If you are an advanced player who has already mastered basic chemistry, this chemical molecular model set is a qualified assistant.
EASY TO ASSEMBLE - The chemical model kit contains 86 high-quality colored atoms and 153 connecting bonds, each atomic plastic ball is brightly colored and durable. You can assemble complex structures in minutes with the guidance of the instructions. The included disassembly tool enables faster separation of the molecules from the connecting bonds, avoiding the hassle of disassembling the model manually.
3D VISUAL - The 3D model kit with colored atoms and chemical bonds shows the structure of compounds more visually, combines theory with practical exercises, helps to understand chemical formulas and theories faster, brings science to life and stimulates students' interest in learning chemistry.
EASY TO IDENTIFY AND STORE - The package includes an instruction sheet to help easily identify all the atoms and connecting bonds and guide students in piecing together the ideal molecular structure model. The outer box is divided into four sections, and all pieces can be placed in the appropriate areas according to personal preference for easy storage and management, making it a sturdy and versatile chemistry tool box.
PRACTICAL LEARNING GIFT - Give this versatile molecular chemistry model set as a gift to students who are interested in chemistry, children who have difficulty understanding chemistry, or chemistry teachers. This molecular model set can develop students' chemistry potential, help them understand chemistry concepts faster, and help chemistry teachers to explain chemistry more visually in the classroom。Make the chemistry chemistry classes less boring

Rank No. #11

Swpeet 240 Pcs Organic Chemistry Molecular Model Student and Teacher Kit, Chemistry Molecular Model Student and Teacher Set - 86 Atoms & 153 Bonds & 1 Short Link Remover Tool

★ BETTER TO UNDERSTAND ---This molecular model is very useful for both the teacher and the student. This molecular model kit will help teachers and parents to cultivate children's interest in chemistry. Let intangible chemical molecules atomic shape transform into tangible. Better to understand and kinds will find it helpful in studying molecular geometry. A great hands-on way to learn!
★ POWERFUL FUNCTIONS --- This model contains C, H, O, N, P, S, F, CL, BR, I and other metals and a variety of single and double bonds, long bonds, long keys. Can be put high school, university chemistry in most of the organic or inorganic molecular structure model for the study of experimental operation.
★ WHAT YOU GET --- Swpeet brings you this terrific 240-piece molecular model set! Each molecular model kit comes with 86 atom pieces made up of 12 different elements. Also included are 153 links: long flexible ones (good for double and triple bonds), medium-length hard links, and two types of shorter space-filling links. Easily separate atoms from the links with the included removing tool.
★ NON-HAZARDOUS MATERIAL --- All models of the factory are made of food grade green plastic, new plastic, atomic ball (PP plastic, music buckle cup plastic) link key (LDPE plastic) box (ABS plastic)
★ CONVENIENT STORAGE --- The pieces come in a slim plastic box for convenient storage. See the pictures on this listing for a full understanding of what's inside!

Rank No. #12

Swpeet 252 Pcs Molecular Model Kit for Inorganic & Organic Molecular Model Teacher and Student Kit - 86 Atoms & 153 Links & 12 Orbitals & 1 Short Link Remover Tool

★ ADVANCED LEARNING SCIENCE EDUCATION KIT --- Perfect chemistry model kit for modeling simple and small to more advanced and complex chemical structures for schools and college level, students of all ages, researchers and enthusiasts. Fun and interactive early learning molecular set for kids of all years and for use in the classroom.
★ HIGH QUALITY --- Made from high quality durable materials designed for easy construction and perfect fit. These Molecular Model Kit pieces are color coded to national standards for easy ID. Organic Chemistry Model Kit includes box for easy storage and transport with your other textbooks, notes, and books. Excellent for the classroom.
★ MOLECULE SCIENCE IN 3D --- We have prepared 252 Pcs molecular model set for you, This model contains C, H, O, N, P, S, F, CL, BR, I and other metals and a variety of single and double bonds, long bonds, long keys. Can be put high school, university chemistry in most of the organic or inorganic molecular structure model for the study of experimental operation.
★ QUICK AND EASY ASSEMBLY OF COMPLEX STRUCTURES --- Atoms and bonds that are perfectly suited to being connected and disconnected easily without making your fingers hurt. We’ve also included a link remover to make the task of diss.
★ CONVENIENT STORAGE --- The pieces come in a slim plastic box for convenient storage. See the pictures on this listing for a full understanding of what's inside!

SaleRank No. #13

SOUJOY 444 Pieces Chemistry Molecular Model, Organic and Inorganic Modeling Kit, Students Teacher Set with Atoms Bond, Links and, Short Link Remover Tool for Learning Science

Package: Include 444 pieces chemistry molecular model kit, including 132 atoms, 158 bonds and 150 parts for Carbon-60(Fullerene), you can now understand 3D complex molecule structures.
High Quality Material: SOUJOY Chemistry model kit is made of high quality PP and LDPE to manufacture, feel smooth, no scraps or cutting edges from the holes, easy to remove and put on.
3D Visual Active Learning: This organic and inorganic model kit is designed for easy chemistry learning for organic, inorganic, ochem and functional groups, you can now understand 3D complex molecule structures with ease by building your favorite molecules with them.
Perfect Gift for Learning: Our chemistry kit is modeling simple and small to more advanced and complex chemical structures for schools and college level, students of all ages, researchers and enthusiasts.
Easy to Storage: The atom parts and links are color coded to national standards for ease of identification, and the pieces come in a slim plastic box for convenient storage.

Rank No. #14

Swpeet 92 Pcs Chemistry Molecular Model Student and Teacher Set, Molecular Model Set for Inorganic & Organic Chemistry - 52 Atoms & 37 Bonds & 3 Orbitals

★ BETTER TO UNDERSTAND --- This molecular model is very useful for both the teacher and the student. This molecular model kit will help teachers and parents to cultivate children's interest in chemistry. Let intangible chemical molecules atomic shape transform into tangible , better to understand. Kinds will find it helpful in studying molecular geometry. A great hands-on way to learn!
★ POWERFUL FUNCTIONS --- This model contains C, H, O, N, P, S and other metals and a variety of single and double bonds, long bonds, long keys. Can be put high school, university chemistry in most of the organic or inorganic molecular structure model for the study of experimental operation.
★ WHAT YOU GET --- Swpeet brings you this terrific 92-piece molecular model set! Each molecular model kit comes with 52 atom pieces made up of different elements. Also included are 37 links: long flexible ones (good for double and triple bonds), medium-length hard links, and two types of shorter space-filling links.
★ NON-HAZARDOUS MATERIAL --- All models of the factory are made of food grade green plastic, new plastic, atomic ball (PP plastic, music buckle cup plastic) link key (LDPE plastic) box (ABS plastic)
★ CONVENIENT STORAGE --- The pieces come in a slim plastic box for convenient storage. See the pictures on this listing for a full understanding of what's inside!

Rank No. #15

Organic Chemistry Student Molecular Model Kit by Molecularity 200 + Pieces

Student Organic Chemistry Molecular Model Kit with Resonating pi bonds
Small and compact to fit in a backpack
patented design allows pi bonds to move, helps to see Resonance Structures
designed by a professor of Organic Chemistry for student success!
EZ to use, fast for use on exams!

SaleRank No. #16

YOPAY 240 Pieces Molecular Model Kit, Organic and Inorganic Chemistry Molecular Structure Model, 86 Atoms and 153 Links and 1 Short Link Remover Tool

YOPAY 240 pieces molecular model kit is your chemistry best friend, it includes 86 Atoms and 153 Links and 1 Short link remover tool, Covering 12 elements: hydrogen, carbon, oxygen, nitrogen, sulphur, phosphorus, fluorine, chlorine, bromine, iodine, metal and boron, you can now understand 3D complex molecule structures with ease to provide hands-on learning experience of molecular structures and functional groups.
The Most Effective and Fun Way to Learn Chemistry - The chemistry molecular structure model kit can unlock and develop your chemistry genius, Models make science come to life! Use atom pieces to practice structures, cyclic compounds, empirical formula, stereo isomerism, and VSEPR theory. Explore chemistry and physics concepts. Visualize atomic structure with atoms, bonds, orbitals, and links.
High Quality and Portable - It is extremely hard to damage our atom balls or bonds because we used the highest quality PP and LDPE to manufacture. It is made from high quality materials designed for easy assembly. The pieces are color coded to national standards and all kits come with a box for easy storage and transport with your other textbooks, notes, and books.Our model kit is deserve to serve you for years to come.
For All Levels of Learning - The chemistry model kit utilize the ball and stick toys educational structure to teach students from grade 7 to the University Graduate Level (Over 12 years). Demonstrate fundamental molecular geometry, chemical and biology structure, stereo chemistry with 3D modelling studies.The perfect tool for memorizing organic, inorganic and functional group chemistry.
3D Visual Active Learning, Let's Build; Thanks to our universal standard color coded Atomic Balls, you can now understand 3D complex molecule structures with ease by building your favorite molecules with our 240 ball and stick models, The YOPAY Atom Model Kit is your chemistry best friend.

Rank No. #17

HGS Stereochemistry Molecular Model 4010Alpha / Basic Set

HGS Maruzen (Author)
English (Publication Language)
07/12/2024 (Publication Date) - HGS Maruzen (Publisher)

Rank No. #18

Jingzan 136 Pieces Organic Chemistry Model Kit, Chemistry Molecular Model Kit Set for Student or Teacher - 59 Atoms & 76 Bonds & 1 Short Link Remover Tool - Science Toys

1.Advanced design and rich configuration, it can be matched with various ball and stick models and scale models in chemistry textbooks. For example: water, oxygen, hydrogen, ethanol, phenol, acetaldehyde, ethyl acetate, etc. Help you learn and understand the physical and chemical properties of compounds.
2.Durable Model: PP (polypropylene) plastic Atoms have good durability, high gloss and well texture. LDPE (Low density polyethylene) plastic linking bonds have perfect durability and perfect bending property. The product can endure many years. Never worry about broken problem.
The molecular kit is perfect for learning and teaching organic chemistry, home school educating, giving as great birthday gifts for all ages.
All atoms are color-coded to universal standards making identification easy, made of food grade non-toxic plastic, no harm to human body and environment.
This organic Chemistry model can help Chemistry learner understand the 3 dimension atom and molecule in invisible micro world. It’s an essential tool to inspire children or students’ interest when learning Chemistry. In addition, the model can enhance practical ability to link the molecular. For teachers or parents, you can teach your students or children about the complex molecular structure much easier than only picture in books!

Rank No. #19

136pcs Organic Chemistry Molecular Model Set for Student and Teacher Inorganic & Organic Academic Chemistry Education 59 Atoms & 76 Links Bonds & 1 Link Atoms Remover

Material: Made of plastic. This model kit contains C, H, O, N, P, S, Cl and other metals and a variety of single and double bonds.
Package Include: This model kit has a total of 136 pieces including 59 atoms, 76 bonds, 1 remover tool and 1 plastic storage box.
Build Your Own 3D Molecule Model: You can now use this model kit easily understand 3D complex molecule structures by building your own molecules.
Easy to Install and Remove: This model kit makes it easier for you to use and learn. Atoms and chemical bonds combine tightly and firmly and can be easily disassembled by remover tool.
Applications: This molecular model kit is very useful for both the teachers and the students, perfect back to school supplies. It will cultivate children's interest in chemistry and studying molecular geometry.

Rank No. #20

HGS Polyhedron Molecular Model 1003Alpha Organic Chemistry Basic Set <2nd Edition>

HGS Maruzen (Author)
English (Publication Language)
07/12/2024 (Publication Date) - HGS Maruzen (Publisher)

Last update on 2023-07-29 / Affiliate links / Product Titles, Images, Descriptions from Amazon Product Advertising API

How Do You Buy The Best Hgs Molecular Model Kit?

Do you get stressed out thinking about shopping for a great Hgs Molecular Model Kit? Do doubts keep creeping into your mind? We understand, because we’ve already gone through the whole process of researching Hgs Molecular Model Kit, which is why we have assembled a comprehensive list of the greatest Hgs Molecular Model Kit available in the current market. We’ve also come up with a list of questions that you probably have yourself.

We’ve done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for Hgs Molecular Model Kit that you consider buying. Your questions might include the following:

Is it worth buying an Hgs Molecular Model Kit?
What benefits are there with buying an Hgs Molecular Model Kit?
What factors deserve consideration when shopping for an effective Hgs Molecular Model Kit?
Why is it crucial to invest in any Hgs Molecular Model Kit, much less the best one?
Which Hgs Molecular Model Kit are good in the current market?
Where can you find information like this about Hgs Molecular Model Kit?

We’re convinced that you likely have far more questions than just these regarding Hgs Molecular Model Kit, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for Hgs Molecular Model Kit, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible Hgs Molecular Model Kit. Make sure that you are only using trustworthy and credible websites and sources.

We provide an Hgs Molecular Model Kit buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information. How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available Hgs Molecular Model Kit currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

Brand Value: Every brand of Hgs Molecular Model Kit has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
Features: What bells and whistles matter for an Hgs Molecular Model Kit?
Specifications: How powerful they are can be measured.
Product Value: This simply is how much bang for the buck you get from your Hgs Molecular Model Kit.
Customer Ratings: Number ratings grade Hgs Molecular Model Kit objectively.
Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their Hgs Molecular Model Kit.
Product Quality: You don’t always get what you pay for with an Hgs Molecular Model Kit, sometimes less, and sometimes more.
Product Reliability: How sturdy and durable an Hgs Molecular Model Kit is should be an indication of how long it will work out for you.

We always remember that maintaining Hgs Molecular Model Kit information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding Hgs Molecular Model Kit is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly! We’re here for you all the time. Contact us here. Or You can read more about us to see our vision.

The Best Hgs Molecular Model Kit of 2023 – Reviewed and Top Rated

How Do You Buy The Best Hgs Molecular Model Kit?

Related Post: