Bilstein 5100 Series Shocks Absorbers are available with a durable monotube design, featuring a unique gas-pressure construction and a durable multi-layer zinc finish. The shock absorbers are just what you need for correcting the tuning and length of your vehicle's lift for truly enhanced handling and superior performance! Each shock absorber has been individually engineered for a perfect fit on your custom vehicle and lift combination. The bolt-on installation is quick and simple, and requires no modifications to your vehicle. Bilstein 5100 Series Shocks Absorbers are backed by a limited lifetime warranty.