WavePro High Performance Pedestals use aircraft grade aluminum for high strength and light weight, with a hard anodized finish to reduce friction. All seals and O-rings have been designed specifically for friction reduction and long life in the WavePro Pedestal. Extremely easy to adjust air chamber provides a bottomless feel. One of the finest made hydraulic shock absorbers in the world. Contact us at (920)269-2628 line1 or info@theboatdoc.com for more information.