Renthal (252-520-13GP) 13-Tooth Front Countershaft Sprocket Fits: Kawasaki KX250 1987-1998, KX500 1987-2005, KDX200/220 1984-2005, KDX250 1992-1998, KLX300 1997-2001; Yamaha YFZ350 Banshee 1989-2006,YFM350X Warrior 1989-2006, YFM350 Raptor 2005-2010, YZ250 1988-1998, WR250 1989-1998, YZ490 1985-1989 Renthal front chain wheels are simply the finest front chain wheel on the market today Front chain wheels feature a specially developed nickel-chrome-molybdenum steel which is case hardened and core refined to give the ultimate combination of strength and hardness Features self-cleaning mud grooves between every tooth on both sides help prevent dirt build up Precision CNC machined to extremely tight tolerances