Self-rising gravity lift seat eliminates mechanical lifting devices. Engineered copolymer outer seat and back panels are dent-resistant and easy to clean. E-coated cast iron and steel parts and non-corrosive hardware grant spirit long-lasting durability. Spherical bearings compensate for any irregularities in the floor or risers. Cast iron standards dampen vibrations. Reinforced engineered copolymer seat and back inner structure adds strength and durability. Wide selection of finish colors and marine-grade vinyl upholstery protected by a virtually maintenance-free wrap-around hard surface.