Polyurethane bushings are stronger and last longer than standard rubber bushings. Most modern production vehicles are equipped with rubber bushings that have a limited service life The quality and service life of this product exceeds the original part with a Shore hardness of 90A. The full vehicle equipment list can be found in the product description This product is made of the highest grade polyurethane and the hardness of the bushing is matched to the application PSB bushings are designed to be easy to assemble without special tools PSB bushings last longer, require less maintenance, and ensure longer tire durability