The original rubber bushing is proven to be a weak link that can fail prematurely, allowing chassis geometry to be compromised. Symptoms include suspension movement during acceleration, braking and cornering. The powerflex black series bushing is manufactured of a more dense rubber than the original. It is a 95 shore compound that is more resistant to load than standard rubber which provides better control of chassis geometry for track use. Features: designed for track use improved track handling more precise and accurate alignment constant steering geometry increased tire life better steering feedback longer service life of suspension components less nvh (noise vibration hardness) than polyurethane bushings pl...(choose a part on the right to read more)