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 250 F (2005, 2010, 2011, 2012, 2008, 2013, 2001, 2003, 2006, 2002, 2004, 2007, 2009); Yamaha YZ 250 F (2006, 2009, 2013, 2002, 2004, 2011, 2003, 2005, 2007, 2008, 2012, 2001, 2010)