Supersprox - Rear Sprocket 40T Black for KTM 1290 SuperDuke R, GT 2014+ (RFE-613:40-BLK)Drive Sprocket Rear Steel Drive Sprocket CAD Designed and CNC Laser cut to ensure an exact fit. One of the lightest all steel sprockets on the market. The steel material lasts 3 times longer than aluminum. Developed on the race track to give longer system life and high performance. Include our exclusive 2x zinc for anti corrosion and black finish. Special tooth design increases chain contact and significantly extends the sprocket life. Spec MATERIAL