All stops are designed to protect your suspension from serious impacts. Some vehicles come with pre-installed stoppers. However, these OE stops are usually made of rubber. While rubber is good at absorbing and redirecting impacts, it doesn't last long. Prone to cracking, rot, and eventually fall off, rubber bumpers will eventually leave your suspension completely exposed. Prothane manufactures all of their bumpers with high quality polyurethane, a material tested and tested to be much more durable and reliable than OE rubber. Once you install Prothane's wear and pollution resistant bumpers, you won't have to worry about the safety of your suspension again. .