We choose to use C63000 nickel bronze as a material to make valve guides because of its ideal characteristics for the application.The 4-5 percent nickel content produces superior resistance to wear, and the approximately 80 percent copper content delivers outstanding heat conductivity.Guides sold eachWe choose to use C63000 nickel bronze as a material to make valve guides because of its ideal characteristics for the application. The 4-5 percent nickel content produces superior resistance to wear, and the approximately 80 percent copper content delivers outstanding heat conductivity. Guides sold each This item fits the following applications: 2004-2016 Kawasaki KX250F