Gabriel G51779 Ultra Spring Seat Orifice disk with variable nine-stage valving provides consistent oil flow resulting in improved ride quality on a variety of terrains G-Force technology for quicker response, improved product life, and consistent, reliable ride and control StableSteer valving provides response from all four corners for a stable, safe ride G-Force piston is constructed from iron for durability and longer life, along with the heavy duty compression head valve that withstands extreme impact Leak-proof piston seal and rod guide eliminates oil bypass