Sunstar Steel Rear Sprocket - 40T , Sprocket Teeth: 40, Color: Natural, Sprocket Position: Rear, Sprocket Size: 530, Mat Constructed of the highest quality 1045 high-carbon steel Exclusive heat treatment for added strength and wear resistance Most are zinc plated and have a baked on durable paint process for corrosion resistance The strongest, longest lasting steel replacement sprocket available Nearly all motorcycles come equipped from the factory with this sprocket