ENERGY SUSPENSION performance polyurethane sway bar bushings and end links offer the greatest improvement in performance among all the products ENERGY offers. They make a vehicle's sway bar system much more effective like adding a larger, higher performance sway bar! Economy, increased efficiency, and easy installation are just some of the reasons these products are so popular. Made of HYPER-FLEX™ polyurethane that lasts much longer than O.E.M. rubber bushings.