RK Vortex O-Ring Blk QA Chain and Sprocket Kit for SUZ GSX-R600 04-05 RK Chain Model: 520XSO-110 RK Chain Type: Gun Metal O-Ring Vortex Front Sprocket: Steel 15 Tooth Vortex Rear Sprocket: Black Alum 45 Tooth Bike's Stock Gearing: 16-45