Premium, 137 piece organic molecular model set 66 atoms, 70 bonds and 1 removal tool for building a variety of organic compounds Comes in a plastic storage box with four compartments for easy organization Includes instruction manual Excellent visual learning tool for students Student Molecular Model Set This premium quality, 137-piece molecular model set allows you to build a variety of organic compounds. Great for molecule demonstrations, studying and for providing students with a visual and kinesthetic aid for learning the structure and properties of various molecules. Set comes in a plastic 9.25" x 6.75" storage case with four compartments for easy organization, and an instructional manual. Included in this set: Atoms: (14) Carbon - 4 holes (6) Carbon - 3 holes (6) Oxygen - 2 holes (22) Hydrogen - 1 hole (2) Nitrogen - 3 holes (1) Sulphur - 4 holes (1) Sulphur - 6 holes (1) Phosphorus - 4 holes (6) Halogen Cl - 1 hole (6) Halogen F - 1 hole (1) Metal - 1 hole Bonds: (28) Medium (12) Long, Flexible (30) Short (1) Removal tool