... start from industrial steel forging and has 27 years' manufacture experience Motorcycle sprocket chain wheel feature:1\high quality ... 56T etc.front sprocket12T/13T/14T/15T/16T/17T Chain 420,428,428H,520,530MaterialA3# steel(SAE Q235), ... quenching,heat-treated by mesh belt furnace and carburizingSurface finishingPlate zinc, nickel plate, chromeplate,Sandblasting, Dull polish, Painting, Electrophoresis ...