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 250 F (2015, 2018, 2016, 2017, 2014); Yamaha YZ 250 FX (2016, 2015, 2018, 2017); Yamaha WR 250 F (2015, 2018, 2014, 2017, 2016)