Vortex 452AS-41 Black 41-Tooth 520-Pitch Steel Rear Sprocket Fits: 2006 kawasaki zx636 ninja zx-6r, vortex steel spkt - 452as-41 520 rear sprocket - steel - black - 41t Vortex steel spkt - 452as-41 Manufacturer: vortex Photos are for reference only, please read title and product description carefully.