Trail Gear shocks are specially developed by the world's leading off-road shock manufacturers, Bilstein and Fox, for Trail Gear's extreme off road rigs. The Bilstein Trail Gear shocks are mono tube gas pressure shocks. These off road shocks are designed for vehicles with one inch of lift to two and a half inches of lift. The Bilstein Trail Gear shocks utilize vulcanized neoprene rubber bushings for long bushing life, while still allowing a bit of flex under off road stress. The Fox Trail Gear shocks are designed specifically for hardcore rock rigs, pre-runners and sand rails. These off road shocks are completely adjustable to your specific vehicle's suspension load requirements. The oil filled Fox Trail Gear shocks can be completely rebuilt if needed, and are designed for vehicles with extreme lift that require a maximum amount of travel.