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It provides an interface between two parts, damping the energy transmitted through the bushing. This movement allows the suspension parts to move freely, for example, when traveling over a large bump, while minimizing transmission of noise and small vibrations through to the chassis of the vehicle. These bushings often take the form of an annular cylinder of flexible material inside a metallic casing or outer tube. Many different types of bushing designs exist. The flexibility of rubber also introduces an element of play in the suspension system. For this reason, a popular aftermarket performance upgrade is the replacement of rubber suspension bushings with bushings made of more rigid materials, such as polyurethane.