Molecular Model KitsThis system is designed for teaching concepts related to molecular structure. Using high quality plastic moulded spheres and connectors a wide variety of atomic structures can be learned. Designed to create open models. Kit contains: Spheres - 14 carbon, 8 oxygen, 9 halogen, 4 nitrogen, 2 sulphur, 25 hydrogen; 30 short links, 30 medium links and 15 long flexible links. .