RK Racing Chain 2108-068RG Silver Aluminum Rear Sprocket and GB520GXW Chain 520 Race Conversion Kit Fits: Kawasaki ZX1000D (ZX-10R) 06-07 520 race conversion kit contains: 16 tooth chromoly front sprocket; 40 tooth silver 7075 T6 aluminum rear sprocket; and RK GB520GXW-108 link gold chain Sealed XW-ring chain features heat treated high carbon alloy steel components with seamless rollers and shouldered bushings providing the user with a 50 percent longer wear life than basic O-ring chains XW-ring uses an advanced nitrile butadiene composite and features three contact lips and two convex outer stabilizers; this means three lubrication pools to protect against high speed abrasion, extreme heat build up, torsional flex and loss of lubricant XW-ring chains are the best high-speed, extreme heat performance chains available today and include a clip type master link