Nitrogen charged monotube design with internal reservoir. One piece linear/digressive piston design with vehicle specific valving for unsurpassed performance and ride quality on and off-road. 5/8 chrome plated hardened steel shaft resists corrosion and pits. 6061 aluminum rod end, top cap, and internals ensure strength and durability. Polyurethane bushings, zinc plated sleeves, and forged steel mounting stems for OE factory type fitment.