SuperPro crafts all of their control arm bushings with polyurethane, a material much more durable than rubber. Polyurethane bushings, with their increased durability, are commonly associated with increased NVH. SuperPro realized this and has gone to great lengths to offer the best of both worlds. Utilizing polyurethane bushings to enhance performance, and carefully researching designs to minimize NVH, SuperPro has managed to form some of the best bushings available for those looking to enhance their control without affecting ride quality. SuperPro's use of knurling on their bushings is another result of careful research. This knurling allows grease to stay on the bushings for much longer, reducing the amount of maintenance you have to do. If all of that wasn't enough, all of SuperPro's control arm bushings are covered with their lifetime warranty, handled in-house here at DST.