The MotoSport.com Sunstar Chain & Aluminum Sprocket Combo includes ONE Steel Countershaft (Front) Sprocket, ONE Aluminum Rear Sprocket, and your choice of ONE Premium Drive Chain, each with the following features: Sprockets / Chainwheels Included: 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. Sunstar Front Sprocket: Manufactured from case-hardened chromoly steel for the ultimate in strength and durability. "Parkerizing" surface treatment for rust and corrosion resistance. Sunstar Aluminum Rear Sprocket: