Look on any serious off-road Jeep and you will find polyurethane suspension bushings. Unlike common rubber bushings which lose their shape, and get softer over time, self-lubricating urethane bushings last and last. Polyurethane is not susceptible to the elements that destroy rubber such as oil, road salts, ultraviolet rays and dry rot. Energy Suspension is the world leader in polyurethane suspension components. Major efforts in research and development in both chemical and mechanical engineering have enabled Energy Suspension to become number one.