Polyurethane is designed to last. It doesn't rot or deteriorate from oils, road salt, chemicals or atmospheric contaminates such as ozone or smog. That means our bushings will not deteriorate and cause mushy, uncertain responses when driving. Prothane components make a drastic improvement in the way your Jeep handles. Includes the necessary bushings, metal sleeves and a tube of synthetic grease to insure proper lubrication.