Designed specifically for the JL 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.