Molecular models are NOT toys and should be kept away from young children. These sets and kits are intended for educational use only.Prentice Hall. This set of plastic atoms and bonds enables students to construct ball-and-stick as well as space-filling models of organic compounds. Included are 14 tetrahedral carbon (black), 28 hydrogen (white), 8 oxygen (red), 8 chlorine (green), 4 nitrogen (blue), 2 bromine (orange), and 2 iodine (purple) atom centers. Approximate atom diameters, 2 cm. Set contains 40 single bond and 12 multiple bond connectors for ball-and-stick models and 40 linkers for space-filling models. Instruction booklet included. The components in this set are fully compatible with all Molymod® model sets.