These adjustable strut mounts feature polyurethane bushings for quiet operation and maximum performance, and are CNC machined from 6061 heat treated aluminum. The TIG welded strut hats increase strut travel which is especially important on lowered cars.These plates also come complete with special strut boots and bump stops. Note: We do not recommend the use of caster/camber plates on coil-over equipped vehicles. California Residents WARNING