Designed specifically for the TJ Wrangler/Unlimited, TeraFlex 9550 VSS (Vehicle Specific Shocks) Twin-Tube Shocks are engineered, valved, and tuned for extreme off-road performance while retaining a smooth highway ride. Additionally, a proprietary inhouse velocity valve is tuned to react in sync with TeraFlex suspension systems and lift kits making them the perfect upgrade for your lifted Jeep. The twin-tube design, oversized external tube with e-dipped finish, triple-chrome plated rod with oil block and seal, internal travel stop limiter, premium quality rubber bushings, and Jeep specific mounting contributes to the 9550 VSS Twin-Tube Shock?s performance, durability, and comfort.