Pro Comp Suspensions 929504 - Es9000 Series ShockPro Comp Es9000 Series Shock is designed for increased load capacity and a high performance ride with better handling characteristics. The shock is nitrogen gas-charged with expanded twin-tube design which increases fluid capacity by 50% which helps reduce internal operating temperatures. It has a 10-stage velocity-sensitive valving, a 1 3/8" nylon-banded full-displacement piston, and a large 5/8" hard-chromed piston rod. Pro Comp USA was founded in 1992 and has since then manufactured high-quality, durable products for both on and off road enthusiasts. Pro Comp products include tires, wheels, suspension systems, shocks, and more