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 WR 450 F (2007, 2004, 2011, 2009, 2012, 2006, 2003, 2005, 2013, 2014, 2008, 2015, 2010); Yamaha YZ 450 F (2009, 2004, 2008, 2003, 2006, 2005, 2007)