Rancho's affordable RSX17000 shocks automatically adjust themselves to the terrain, providing a better ride--on or off-road. These shocks have a valve system that instantaneously reacts to shock compression. During more aggressive compression caused by rough surfaces, the valve automatically opens to reduce ride harshness. During lighter compression, the valve closes to give you tighter handling and a smoother ride. Other features include nitrogen gas-charged twin-tube construction, bright red urethane mounting bushings, and a red convoluted boot to protect the shaft.