Pro Comps Pro Runner Monotube Shocks are designed specifically for late model trucks, Jeeps and SUVs. The gas charged, monotube design delivers superior performance over traditional twin tube, hydraulic shocks. The vehicle specific ride tuning was derived after extensive dyno and real-world testing. The result is multi-stage valving that optimizes ride quality and handling characteristics for your specific application. The brushed, Zinc plated, clear coated, monotube shock body is nitrogen gas charged to eliminate performance-robbing cavitation during compression and rebound, allowing the shock to dissipate heat more efficiently, drastically reducing shock fade. Whether you are towing a trailer or hitting whoops in the desert, you can count on Pro Comps Pro Runner(TM) Shocks to give you the confidence behind the wheel.