Features Excellent Plastic Material: This silicon dioxide molecular structure model is made of excellent plastic material, which is sturdy and wear resistant, not easy to be damaged and has a long service life. Multifunctional: This silicon dioxide molecular model can be used for the demonstration of teaching content about molecular structure in secondary schools, in order to enhance students' spatial concept and facilitate the understanding of the structure of Detachable: The atoms and chemical bonds of this silicon dioxide molecular structure model are tightly bonded and can be easily removed with a disconnect tool. Wide Application: This silicon dioxide molecular structure model is widely used, and can be used in schools, laboratories and so on. Good Distinction: This silicon dioxide molecular model has different atomic sizes and colors for different elements, making it easy to distinguish between them. Specification: Item Type: Silicon Dioxide Model Material: Plastic Instructions: The crystal structure of silicon dioxide is atomic crystal, each silicon atom is surrounded by four oxygen atoms arranged in tetrahedrons, oxygen at the top of the tetrahedron, tetrahedrons are connected to each other through oxygen atoms. Package List: 40 x Silicon Atom 30 x Oxygen Atom 80 x Single Chemical Bond 1 x Storage Box   Package List 40 x Silicon Atom 30 x Oxygen Atom 80 x Single Chemical Bond 1 x Storage Box