Learn chemistry by putting the elements together to create a visible structure to learn from! This is an excellent set for students ranging from middle school to university. The flexible plastic bond allow for easy demonstrations of double bonds and triple bonds. The molecular model set is ideal for the use of studying simple organic and inorganic molecules. The molecular model set contains a number of different colored plastic spheres to represent various atoms. The atoms have holes at specific angles to accept plastic rods representing covalent and ionic bonds. The set allows you to build structural models of over 40 compounds. Set includes 84 plastic spheres 17-23mm in diameter, and 2 metal atoms-17mm in diameter. Bonds included are 60 medium connectors, 68 short connectors and 25 long flexible connectors. The set also includes a plastic storage box with a lid, four compartments, bond disconnection tool and an instruction manual.