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This model contains multiple sets of atoms, many kinds of metal atoms,and the proportion of single and double bonds, long key, extra long key. You can make high school and college chemistry most organic and inorganic molecular modeling and affordable. Specification: Size: 29*25*10cm 21 * atomic sphere models 7* Molecular bond model Material: Plastic Package Including This model contains multiple sets of atoms, many kinds of metal atoms,and the proportion of single and double bonds, long key, extra long key. You can make high school and college chemistry most organic and inorganic molecular modeling and affordable.