Our motorcycle sprockets are national standard, durable in use, good reputation. SpecificationsRear sprocket: 34T/35T/36T/37T/38T/39T40T/41T/42T/43T/44T/445T etc.Front sprocket: 13T/14T/15T/16T/17T etc415,420,428,428H,520 etcMaterialA3# steel(SAE Q235), 45# steel(SAE Q345B) ect.Surface treatmentThrough heat treatment in guarantee hardness and abrasion resistance