Material: This professional grade service jack combines the strength of steel with the lightweight benefits of an anodized aluminum frame; The polished plunger pistons provide a smooth surface for a longer seal life. System: The jack features a twin hydraulic system for faster and easier lifts with a double pumper technology for maximum speed. Features: Model comes with front rollers for easy portability and wiper seals to prevent dirt from entering the hydraulic system; Additional machining also ensure the tightest tolerances.