This kit enables users to build virtually all simple molecules encountered in organic chemistry. Includes space-filling models that simulate the true shape of saturated compounds Provides open models that form realistic single, double, and triple bonds - even strained rings Allows smooth rotation of the bonds to make conformational analysis easy Includes a Instruction Book - with photos, diagrams, and concise discussions of chemical principles The set includes: 28 Hydrogen (white) 14 Carbon (black) 8 Oxygen (red) 4 Nitrogen (blue) 8 Chlorine (green) 2 Bromine (orange) 2 Iodine (purple) 40 Single Bond, Space-filling Models (white) 40 Single Bond, Open Models (short grey) 12 Double and Triple Bonds, Open Models (long grey)