Nautalift Gas-Filled Supports are made with annealed steel rods that are nitride-coated for corrosion resistance. Designed as exact-fit OEM replacements, these nitrogen-filled supports feature engineered polymer rod ends and a long-lasting tri-lobe internal seal. Bronze bushings retain lubrication for smooth operation. Electrostatic black paint finish on steel tube provides corrosion protection. Industry standard 16mm composite end fittings for no rattles, no rust, and no problems.