Tusk Billet Aluminum Engine Plug Kit Blue -Fits: Yamaha WR450F 2011-2015 Made from CNC machined 6061-T6 aluminum. Anodized colors for corrosion resistance and to give your bike a factory look. Utilizes a hex center for easy removal with an Allen wrench. Kit includes both timing plug covers found on the stator cover. O-rings not included.