Prox Racing Parts 28.3402-1 Steel Replacement Exhaust Valve Fits: Suzuki DR-Z 400 2000-2012, LT-Z 400 2003-2012; Kawasaki KLX 400 R 2003, KFX 400 2003-2006 Specs: Location: Exhaust; Material: Steel; Number of Valves Included: 1; Head Diameter: 29.00mm; Length: 81.35mm; Stem Diameter: 5.00mm ProX steel valves are manufactured of premium grade steel to exact OEM specifications and tolerances Manufactured by the leading OEM factories in Japan and are a direct and cost-efficient OEM replacement ProX steel valves can be used in combination with all the OEM valve train components like valve springs, guides, bases and retainers