Pro Comp's Pro Runner Monotube Shocks are a gas charged, monotube design that 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 Comp's Pro Runner™ Shocks to give you the confidence behind the wheel.