Pro Comp's Pro Runner SS is engineered for late model trucks & SUVs with coilover strut-style, independent front suspensions. Pro Runner SS monotube shocks do more than just improve vehicle ride and handling. They also provide the option of raising the front suspension up to 2.75 depending on application or maintaining the factory ride height and rake thanks to the patent pending 180* SS height adjustable collar. Note: Retains Factory Coil Spring, Coil spring not included. The Pro Runner Monotube shocks deliver the most "bang for your buck" when combined with the new Pro Runner Control Arms. At the heart of the shock is the gas-charged monotube design that delivers superior performance compared to traditional twin tube shocks. The brushed and zinc-plated, clear coated monotube body is nitrogen gas pressurized to eliminate performance-robbing cavitation during compression and rebound. This allows the shock to dissipate heat more efficiently. The Vehicle Specific Ride Tuning (VSRT) in each shock was derived using extensive dyno and real world testing. The result is multi-stage valving to optimize the ride and handling characteristics for each application. Whether you are towing a trailer or hitting woops in the desert, you can count on Pro Comp Pro Runner monotubes to give you the confidence behind the wheel."