255 Atom-parts and 200 links A semi-spec filling set for making compact models of a very wide range of biochemical structures. See photo Contents: 66 Carbon (42 tetra, 24 tribipyr), 6 Phosphorus tetra, 34 Nitrogen (12 tetra, 12 tribipyr, 10 ang), 40 Oxygen (20 ang. 10 lin, 10 mono), 105 Hydrogen (100 MOLYDOME type, 5 liner), 2 Sulphur ang: 2 metal (1 tetra, 1 octa). Links: 200 links (100 short white, 100 NV-links), 2 short link remover tools.