Energy Suspension is the originator of polyurethane suspension components. These isolators will improve the handling of any vehicle without sacrificing ride quality. They protect suspension components from damaging, metal-to-metal contact. They are made of polyurethane, so they won’t rot or deteriorate the way rubber parts will, outlasting original equipment many times over. Prevents expensive damage to suspension components. Durable polyurethane construction for long life. Avoid spending tons on expensive suspension repairs with these inexpensive Rear Coil Spring Isolators for your PT Cruiser.