The Molymod® Molecular Model Set manufactured by Spiring Enterprises Ltd. contains: 21 Black carbon atom parts: 9 trigonal, 12 tetrahedral 13 Red oxygen atom parts: 2 single hole, 11 two-hole angular 25 White hydrogen atom parts: 22 single hole, 3 two-hole linear 11 Blue nitrogen atom parts: 2 two-hole angular, 6 trigonal, 3 tetrahedral 1 Yellow two-hole angular sulfur atom part 1 Purple tetrahedral phosphorus atom part 40 Medium length grey links 10 Flexible long grey links Storage box Instructions