Accuracy and performance. Accurate rates to within 2 percent. High stiffness-to-mass ratio, shot-peened, heat-treated and preset chrome silicon steel. Choose from varying spring rates to suit your biking needs.This item fits the following models: 2013 Kawasaki KX250FAccuracy and performance|Accurate rates to within 2 percent|High stiffness-to-mass ratio, shot-peened, heat-treated and preset chrome silicon steel|Choose from varying spring rates to suit your biking needs