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. Item Type: Molecular Model Kit Material: PP Ball Diameter: Approx. 17-23mm / 0.67-0.91in Use: This model can be used to assemble CH4, C2H6, C2H4, C2H2, C6H6, C6H5OH, C2H5OH, CH3COOH and other proportional models, suitable for students. 57 x Molecule Balls 40 x Proportional Single Bond 10 x Proportional Double Bond 1 x Wrench