Chain and Sprocket with Keepitroostin Sticker Fits Yz125 2005-2013 Yz250f 2001-2013 (13 front sprocket 49 rear sprocket, Silver) Front Sprocket-Jt Racing Steel Tooth Sprocket Rear Sprocket-Renthal Aluminum Racing Sprocket Wps Gold Heavy Duty Chain Tensile strength of 7,480 lbs Fits Yamaha Yz125 2005-2013 Fits Yamaha Yz250f 2001-2013