Adds performance to any shock. Benefit from better durability over O.E.M. rubber bushings. Important to use for competition of any kind. Great for show vehicles - adds that finishing touch. Made of Energy's Hyper-Flex performance polyurethane. Product Features:Made from HYPER-Flex PolyurethaneGives Shock Maximum EfficiencyAdd to the Performance of Every ShockGives Instant Response/Control to Suspension