... gear:34T--57T 2. Heat treatment. 3.Certification:ISO9001 Color zinc plated Motorcycle sprocket Material: A3 steel, 45# steelSpecificationsModel:415,420 ... , RD125, RZD125, RS125, SR125, TW125, TZR125, YB125, XT125, YBR125 Color zinc plated Motorcycle sprocket