Sunstar Steel Rear Sprocket - 45T , Sprocket Teeth: 45, Color: Natural, Sprocket Position: Rear, Sprocket Size: 520, Material: Steel 2-355945 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