Smooth Performance: Polyurethane rebound bumper and bushings and graphite-filled fluon-banded piston help absorb ride harshness and enhance responsiveness to changing road conditions for an overall smoother ride Strong and Durable: Features an application-specific 18mm nitro-carburized piston rod to resist scuffs and corrosion, double-welded loops at stress areas and 1.25-in. sintered iron piston for enhanced structural integrity For Maximum Performance: Recognized as the first nine-position manually adjustable shock series in the off-road market; allows customized damping control and firmness for on-road and off-road flexibility Nitrogen Gas Charged: Nitrogen gas pressurized to 120 PSI to minimize air-to-oil mixture and reduce damping performance fade and foaming Vehicle Compatibility: Fits 1997-2003 F150 4WD with 0” Lift; includes a limited lifetime warranty