RK Racing Chain 3066-018RK Black Aluminum Rear Sprocket and GB520XSO Chain 520 Race Conversion Kit Fits: Suzuki GSX-R600 01-03 520 Race Conversion Kit contains: 15 tooth chromoly front sprocket; 45 tooth black 7075 T6 aluminum rear sprocket; RK GB520XSO-110 link gold chain RK's new XSO chains offer quality, performance and unbeatable value for all; the most demanding high performance application Viewed in cross-section, the RK RX-Ring has two lubrication pools and seal points versus the single seal point/pool design of a regular O-ring chain All components of the MXZ4 chain are heat treated using RK's exclusive HIT (Heat Induction Transfer) process and include a clip type master link