... quality and reasonable price 2,Thickness:6.8-7.0mm Motorcycle sprocket 3,we pass ISO9001 Quality System Certificate 4, Sprocket ... heat treatment in guarantee hardness and abrasion resistance.5, our motorcycle sprockets are national standard , quality guarantee ,long lasting working life ... /37T/38T/39T/40T/41T/42T/43T/50T/54T.Chain :420,428,428h,415,530Material A3steel(SAE Q235),45#steel(SAE 1045 ...