White Diamond valves are CNC machined from one-piece forgings of EV8 Stainless Steel or Inconel-751 Electroplated with a 360º anode, to produce an even coat of the highest grade hard chrome finish Made in the USA - Yamaha YFZ 450 4x2 (2004, 2006, 2009, 2005, 2007, 2008); Yamaha YFZ 450 X 4x2 (2008, 2010, 2009, 2011); Yamaha YFZ 450R 4x2 (2014, 2010, 2018, 2012, 2015, 2016, 2013, 2011, 2017, 2019, 2009); Yamaha YZ 450 F (2009, 2006, 2005, 2003, 2008, 2004, 2007); Yamaha YFZ 450R SE 4x2 (2011, 2017, 2010, 2015, 2019, 2012, 2014, 2016, 2018, 2013); Yamaha WR 450 (2007, 2014, 2005, 2006, 2013, 2015, 2012, 2010, 2004, 2008, 2009, 2011, 2003)