Get your semi Ready for the Road Ahead with enhanced comfort, stability, and control, with the Dayton Parts High Arch 4-Leaf Spring. By utilizing a layered design, this replacement component is able to provide additional support to the front, center, or rear of a vehicle, while absorbing shocks and minimizing vibrations. Built with a flexible body to decrease the chance of broken axles and bolts. FleetPride is your First Click in Heavy Duty .