Bolt-in Rear Titan Application! Monotube gas pressure construction and Zinc plated. 46mm Bilstein digressive piston, Lifetime warranty Self adjusting deflecting disc valving that is Designed for specific manufacturer lift kits utilizing the stock O.E.M. mounting configuration. 4 Bushings and 4 Sleeves included for 2005-2018 Nissan Titan Rear Bilstein 5125's.