... steel forging and has 27 years' manufacture experience Motorcycle sprocket chain wheel feature:1\high quality steel materials:1045(C45 steel ... /43T…...56T etc.front sprocket12T/13T/14T/15T/16T/17T Chain 420,428,428H,520,530MaterialA3# steel(SAE Q235), C45 steel ... ,G7S,RS100,XRM,DT125,TS125,GP125,XLR,BZLP,HONDA155 Motorcycle sprockets and chain wheel gear teeth hardened