Renthal (492-520-13GP) 13-Tooth Grooved Front Countershaft Sprocket Fits: Yamaha YZ 125 2005-2013, WR 250F 2001-2012, YZ 250F 2001-2013; Gas Gas ECF250F 2013, ECF300F 2013 Renthal Front Chainwheels are simply the finest front chainwheel on the market today Front Chainwheels feature a specially developed Nickel-Chrome-Molybdenum steel which is case hardened and core refined to give the ultimate combination of strength and hardness Feature self-cleaning mud grooves between every tooth on both sides help prevent dirt build up Precision CNC Machined to extremely tight tolerances <a href="https://www.amazon.com/b?node=14770868011"> International products </a> have <a href="https://www.amazon.com/gp/help/customer/display.html/ref=nav_cs_help?ie=UTF8&nodeId=202045290"> separate terms, </a> are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions. Manufacturer warranty may not apply <a href="https://www.amazon.com/b?node=14770868011">Learn more</a> about Amazon Global Store.