The Orbit Molecular modelling set is easy to use and durable. The building system allows you to create accurate 3-D representations of all commonly model compounds.The Orbit building system uses 1cm atoms colour coded according to 12 different elements with prongs set at the correct bonding angles.The Basic Structure Kit Class Set allows the construction of organic molecules inorganic molecules crystals and metals including the structures of sulphur sodium chloride diamond graphite 12 coordinate metals petroleum products polymers acids and bases soaps and detergents nylon water and ice.Suitable for study at G.C.S.E levelsThe set contains 515 atoms 420 bonds and an instruction booklet. Supplied in a compartmented box.