JT Steel Sprockets are the OEM quality choice, manufactured using only the finest grade of C49 high carbon steel for the rear sprockets, and SCM420 chromoly steel alloy for the front sprockets.
Fits:

Kawasaki KX250 L4 2002, Kawasaki KX250 M1 2003, Kawasaki KX250 M2 2004, Kawasaki KX250 R1 2T 2005, Kawasaki KX250 R6F 2T 2006, Kawasaki KX250 R7F 2T 2007, Kawasaki KX250 R8F 2T 2008, Yamaha WR450F 2007, Yamaha WR450F 2008, Yamaha WR450F 2009, Yamaha WR450F 2010, Yamaha WR450F 2011, Yamaha YZ450F 2007, Yamaha YZ450F 2008, Yamaha YZ450F 2015, Yamaha YZ450F 2016, Yamaha YZ450F 2017, Yamaha YZ450F 2018, Yamaha YZ450F 2019, Yamaha YZ450F 2020, Yamaha YZ450F 2021, Yamaha YZ450F 2022, Yamaha YZ450F Monster 2022, Yamaha YZ450FX 2016, Yamaha YZ450FX 2017, Yamaha YZ450FX 2018, Yamaha YZ450FX 2019, Yamaha YZ450FX 2020, Yamaha YZ450FX 2021, Yamaha YZ450FX 2022