The model set comes in a sturdy plastic storage case and the set components are designed to transition to transition to other molecular models to help facilitate classroom instruction. The set includes the following: 12 Hydrogen, white, 1 face4 Carbon, black, 4 faces1 Carbon ...The model set comes in a sturdy plastic storage case and the set components are designed to transition to transition to other molecular models to help facilitate classroom instruction. The set includes the following: 12 Hydrogen, white, 1 face4 Carbon, black, 4 faces1 Carbon, black, 2 faces2 Oxygen, red, 2 faces7 Oxygen, red, 1 face1 Nitrogen, blue, 3 faces2 Nitrogen, blue, 2 faces2 Chlorine, green, 1 face 31 Atom Molecular Model Set The set comes in a plastic storage case and includes durable plastic atom parts and links for assembling different model variations The atom parts range from 30mm to 50mm in size and include 16mm short links for tight connection.