Main informations about our motorcycle sprockets:Specifications:Rear sprocket: 34T/35T/36T/37T/38T/39T40T/41T/42T/43T….58T etc.Front sprocket: 13T/14T/15T/16T/17T etc.415,420,428,428H,520 etcMaterial: A3# steel(SAE Q235), 45# steel(SAE 1045) and 16Mn steel.Surface finishing:Plate zinc, Sandblasting, Dull polish, Painting, Electrophoresis Paint, with the circle line in the surface or as your requirement.