150cc motorcycle sprockets material:40Mn,stainless steel,45# Type:420,428,520,530 Specifications:1)Durable in use2)Deliver in time3)Iso9001certificate of quality and quantity motorcycle sprocket SpecificationsFront:12T/13T/14T/15T/16T/17TRear:35T/36T/37T/38T/39T/40T/41T/42T/42T/43T/44T/45T/46T/47T/48T/49T/50T/51T/52T/53T/54TChain:420,428,428H,415,520,530MaterialA3 steel45#steelHeat treatmentHigh ...