Get your semi Ready for the Road Ahead with enhanced comfort, stability, and control, with the Dayton Parts Full Tapered Front Parabolic 4-Leaf Spring. To provide additional support to the front, center, or rear of a vehicle, this replacement component is crafted with a layered design that absorbs shocks while minimizing vibrations. Fashioned with a flexible body to prevent broken axles and bolts. FleetPride is your First Click in Heavy Duty .