... 3/HRC40-50 hardness 4/ISO9001 certificate Motorcycle sprocket chain wheel feature:1\high quality steel materials:1045( ... much as common sprocket;hardness5\OEM offered, only you offer the technical drawing, we can make it for ... 56T etc.front sprocket12T/13T/14T/15T/16T/17T Chain 420,428,428H,520,530MaterialA3# steel(SAE Q235), ... PICTURESPackage: Motorcycle sprocket CG125 /motor bike drive chain wheel set