B series roller chains 1.material:40MN/A3 2.pitch:6 ... thickness:0.6-17.0mm 4.color:natural.black.blue.yellow B series roller chains 1.material:40MN/A32.pitch:12 ... .700mm3.plate thickness:1.50mm4.color:natural.black.blue.yellow5 ... Motorcycle chains: 428SO,520SO,525SO,530SO3. Roller chains: A series and B series4. Silent chains: SC3,SC4,SC5,SC6,SC8 ...