Energy Suspension shackle sets reduce wheel hop on acceleration, shudder on braking and delivers greater handling control. Great for vehicles with high performance tires and horsepower upgrades. Includes all spring bushings, shackle bushings and zinc plated hardware. The bushings in these shackle sets are constructed from high performance polyurethane, providing stiffer and longer lasting performance than rubber bushings. They are easy to install, providing a quick and simple handling upgrade for your vehicle.