Wise Fold-Down Seats feature state-of-the-art injection molded high-impact marine grade plastic frames, the same quality required by leading boat manufacturers. Compression foam padding remains firm for all-day comfort and is plastic sealed to resist moisture. The upholstery is extra-heavy duty, 28 oz. marine-grade vinyl which is mildew-resistant and UV treated to prevent fading. All seats have a 5-1/4” hole pattern. Mounting screws are included. Aluminum hinges. Less swivel.