Life is based on 4 elements; Carbon, Hydrogen, Oxygen and Nitrogen. With 42 colored Zome nodes as atoms and 24 struts as bonds, the Molecular Mania kit makes a great science project or conversation piece for the office. Using enclosed cards, combine these parts to build 28 different basic molecules of life. Contains 66 Zometool components and 28 Molecule Cards. WARNING: SMALL PARTS. May pose a choking hazard for children under age 3. Made in USA for ages 12+.