EISCO Teacher Molecular Model Set 500 pieces (230) Atoms (270) bonds This teacher s molecular model set contains a large amount of atoms for most basic chemistry models. Includes: [45] Carbon (black) 4 Holes [18] Oxygen (red) 1 Holes [42] Oxygen (red) 2 Holes [12] Oxygen (red) 4 Holes [12] Metal (grey) 2 Holes [10] Metal (grey) 3 Holes [10] Metal (grey) 6 Holes [36] Hydrogen (white) 1 Holes [12] Sulphur (yellow) 4 Holes [15] Nitrogen (blue) 3 Holes [12] Phosphorus (purple) 4 Holes [6] Phosphorus (purple) 3 Holes [170] Medium Bonds [100] Long (Flex) Bonds