Collaboration with Dirt Bike Kidz and Legend Suspensions Spring material is chrome silicon high tensile Springs are shot peened and preset to eliminate sag over time Weighs less than stock spring 250 lb spring rate is 75-77% stiffer than stock Better bottoming resistance Designed for Adult or Large riders Retains overall stock spring length Easy installation Limited Lifetime Warranty USA Made. SPRING RR SHOCK CRF100 HD