520 Series Rear Sprocket (965103) by BikeMaster®. Tooth Quantity: 52T. Finish: Black. Meticulously engineered using the highest quality materials and industry leading technology to provide the best replacement sprockets for your motorcycle. BikeMaster® Rear Sprockets are machined from 1045 steel and coated with a beautiful black Cataphoresis finish. A perfect match for the BikeMaster® line of chains.