Vortex Sprocket: With the Vortex sprocket and chain kit you can expect race quality and killer street looks. The Vortex black aluminum rear sprocket will not only make your motorcycle look faster, it will increase your motorcycles acceleration by reducing the rotating mass. In addition to quicker acceleration, reduced rotating mass also translates into quicker braking and better handling. Vortex makes their front sprockets out of high quality stainless steel that has been drilled to save weight. The Vortex rear sprocket has been anodized black for a durable finish and non-stock look. Constructed of the highest quality 7075 T6 aluminum maximizes durability and weight savings. Vortex uses a CNC machining process to ensure the tightest tolerances and reduced chain drag. Match these Vortex sprockets up with a RK or DID chain for the ultimate combo on your motorcycle. RK Chain: All RK Sealed O-ring type chains feature heat treated hi-carbon alloy steel components with seamless rollers and shouldered bushings, and are fitted with a variety of O-ring seal designs. All RK O-ring seals are made from an advanced Nitrile Butadiene composite for maximum performance and wearlife. D.I.D Chain: D.I.Ds Patented X-Ring construction reduces friction by twisting between the side plates instead of being squashed. Normal O-Rings and other makers modified O-Rings have squashed points that increase friction. The twisting action of the X-Ring disperses the pressure and minimizes power loss. The X-Rings four contact points greatly increase its sealing performance. This keeps the dirt out and the lubrication in much better than any other O-Ring. X-Rings have the greatest wear resistance of any other type of O-Ring or Non-O-Ring chain.