Sunstar 2-355944 44-Tooth Standard Steel Rear Sprocket for 520 Chain Sunstar is the largest O.E.M. supplier of sprockets and brake rotors in the world. In fact, your motorcycle probably came from the factory with a Sunstar sprocket. Need a reason to choose Sunstar? Every Sunstar product is imbued with superior quality, uses an exclusive heat-treatment and quenching process, is based on advanced research and design, and is sold at an added value price. Manufactured using only the highest quality 1045 high-carbon steel.