DescriptionKawasaki® STX™ 2009-2010 Kawasaki® STX-15F™ 2006-2019 Kawasaki® SX-R™ 2017-2019 Kawasaki® Ultra 250X™ 2007-2008 Kawasaki® Ultra LX™ 2008-2019 Kawasaki® Ultra 260X™ 2009-2010 Kawasaki® Ultra 260LX™ 2009-2010We choose to use the copper based C63000 nickel-aluminum bronze as a material to make our bronze valve guides because of its ideal characteristics for the application. The 5% nickel content provides superior resistance to wear, and the approximately 80 percent copper content delivers outstanding heat conductivity. KPMI® guide profiles are designed to have minimal effect on the airstream while maintaining critical cross sectional thickness in high temperature areas, which promotes high performance and endurance.QuantityPkg. of 1MaterialC630 BronzeTypeIntake / ExhaustOutside Dia.: (G)0.4175″ / 0.001″A0.690″B0.730″C0.555″D0.855″E0.460″F0.1960″