Premium bushings made from a synthetic elastomer that provides very similar handling performance and longevity when compared to Polyurethane but without the squeaking. This modern material is firmer than OEM Rubber but has a slightly softer durometer than traditional polyurethane which will improve overall ride quality by eliminating some of the harshness associated with polyurethane. A great compromise that allows you to get both comfort and performance at the same time. Steel Sleeves and correct Washers included. If required the correct 11/16x18 strut rod nuts available under part # 380460-S