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. The evolution of the exclusive Sunstar Z sprocket, now made from the highest quality stainless steel. Weighs up to 50% lighter than standard steel sprockets. 100% heat treated AND even lighter than before with new weight reduction cut outs, but still has a hardness 5 times that of an aluminum sprocket and twice that of a standard steel sprocket. Up to 4 times more durable with 1.2 times the lateral strength of any aluminum sprocket.