Perrin polyurethane end links are made with stiff polyurethane bushings pressed into 6061T6 aluminum arms to provide a solid connection between your sway bar and chassis. This translates into a more predictable and better handling car. Polyurethane bushings are a great alternative to someone wanting the race car type part, without the added maintenance or harshness of spherical bearing type end links. The combination of aluminum, polyurethane, and yellow zinc plated hardware make Perrin performance end links very weather resistant and unaffected by wet climates and road salt. High quality grade 8 bolts and other hardware ensures that you will not have a failure while driving around the track.