Finish: Zinc Plated Bilstein B8 5100 shock absorbers have a gas pressure monotube designed specifically for lifted trucks, SUVs and Jeeps. The shocks feature a 46mm digressive piston with self-adjusting deflective disc valving. Bilstein B8 5100 shock absorbers offer superior damping ability that makes them ideal for heavy hauling or occasional off-road use, while maintaining an exceptional street ride. Bilstein B8 5100 shock absorbers feature a zinc-plated steel body for resistance to harsh off-road elements. Product Features:Individually engineered for a wide array of specific vehicles and lift combinationsMonotube gas pressure technologyEasy to install; direct bolt-on; no modification requiredMulti-layer zinc finish is the most durable in the industry5100 Series provides the most comprehensive range of vehicle applications