168 Atom ? parts and 192 links. This Set is dual ? scale and contains a wide range of elements and atom ? parts hybrisations, and links of all types to make both open and compact models. This is a comprehensive set designed to cover organic stereochemistry, biochemistry, complex ? ions, for school or university use. A good choice for the one ? set teacher. Contents : 64 Hydrogen (60 Molydome, 4 linear), 42 Carbon (30 tetra, 12 tribipyr), 16 Oxygen (12 tetra, 4 mono), 12 Nitrogen (8 tetra, 4 tribipyr), 12 sulphur (8 ang, 4 tetra), 5 phosphorus (3 tetra, 2 tribipyr), 8 cholorine mono, 2 bromine mono, 2 iodine mono, 3 metal octa, 1 alkene group, 1 alkene group. Links : 60 short, 60?non ? visble?, 20 visible, 40 medium and 12 long flexible Packed in there 3 ? compartment plastic box. Shown photograph above.