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Wiseco's titanium valves are made from premium materials and manufactured to the highest quality specifications. A one-piece, forged construction offers high strength and fatigue properties. Chromium nitride coating offering surface hardness and wear resistance. Each design is a drop-in application and requires no piston or head modifications, and will work with stock springs and valve-train. Fits: Yamaha YZ450F 2003-2007, YZ450F 2008-2009, WR450F 2003-2013, YFZ450 2004-2009; 2012-2013, YFZ450X 2011, YFZ450R 2009-2013.