This is an excellent set for middle school through high school chemistry learning inorganic and organic molecules, as well as crystal molecules like graphite and diamond. The springs easily allow demonstrations of single bonds, double bonds and triple bonds. This ball and spoke molecular model set includes 176 plastic spheres, 225 rigid plastic connector tubes and 10 flexible tubes. Spheres are 30mm in diameter, except for hydrogen which are 23mm in diameter. The holes on the molecules are properly placed to make realistic figures. Set includes plastic storage case.

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