Mega Molecules Hydrocarbon Molecular Model Set~ Set Includes 10 Black Carbon Atoms, 28 White Hydrogen Atoms, 34 Red Links for Single Bonds, 6 Red Links for Double Bonds. The Models are Easy to Assemble by Sliding the Links Over the Poles on the Carbon or Hydrogen Models. The Links Represent Bonds between the Atoms. The Links are Red to Emphasize the Energy Stored Within the Bonds. Do Not Throw or Ingest Atom Models or Connecting Links. For Use with Ages 12 and Older. New.