Be in control - when maneuvering through turns, during standing start accelerations, braking, and over bumps and berms. Allows the leaft spring system to function more effectively. For high-performance applications, the combination of heavy duty/performance leaf springs and ENERGY's polyurethane spring bushings deliver maximum benefit. These bushings also improve lighter-duty leaf spring systems, adding a higher degree of performance and durability. In either situation, you'll feel the difference in positive handling and control This product ships in approximately 1 days