Tensilite® valves are CNC machined from one-piece forgings of 6AL4V or 6-2-4-2 titanium alloy Finished with a CrN PVD coating that has a low coefficient of friction, and is impact, abrasion, and corrosion resistant Made in the USA - Yamaha YZ 450 F (2015, 2014, 2016, 2018, 2019, 2017); Yamaha YZ 450 FX (2018, 2020, 2016, 2021, 2019, 2017)