Gabriel G51807 Ultra Spring Seat Shock Absorber It has been precision engineered for today's passenger cars with G-Force technology for the ultimate in safety and performance. The Gabriel Ultra is designed to provide improved comfort, control, long life, durability and maximum shock performance It has infinitely variable damping for on-demand control on all road conditions. The stablesteer valving improves tire contact with the road for control, safety and performance. The G-Force piston provides sintered iron construction for long life and durability It has an orifice control disc for consistent control, comfort and stability. It has an OE-design with a single lip oil seal that minimizes friction for optimal comfort and performance The super-finished chromed piston rod provides superior corrosion resistance. It enhances sealing properties, ensures proper seal lubrication and provides a more consistent wear surface It has a leak-proof piston seal which extends product life