Feature 1[CHEMISTRY TEACHING] The molecular model kit is suitable for inorganic and organic chemistry teaching, helping teacher to explain intuitively and improve student interest in learning. 2[MOLECULE AND BOND] The model kit is composed of colorful molecular balls and connecting bond, these parts can be tightly combined, and can also be disassembled with wrench. 3[PROPORTIONAL MODEL] The molecular model kit can build various common and slightly complex C, H, O, N and chemical organic molecular structures, which is simple and practical. 4[MULTIPLE USAGES] Research and demonstrate basic molecular geometry, chemical molecular structure, spherical molecular structure and stereochemistry through 3D modeling. 5[DURABLE MATERIAL] These models are made of environment friendly PP material, with good toughness, high strength, not easy to break or wear, and has a long service life.SpecificationItem Type: Molecular Model KitMaterial: PPBall Diameter: Approx. 17-23mm / 0.67-0.91inUse: This model can be used to assemble CH4, C2H6, C2H4, C2H2, C6H6, C6H5OH, C2H5OH, CH3COOH and other proportional models, suitable for students. .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List57 x Molecule Balls40 x Proportional Single Bond10 x Proportional Double Bond1 x Wrench