The Tempress Deluxe Casting Seat is an instant classic. Its generous sizing and quality construction will provide years of comfortable and worry free use. The Deluxe Casting seat will fit all seat mounts, swivels, or spiders, with the built in Stainless Steel t-nuts. The base is made from corrosion, rot, and mildew proof plastic. The cushion is high density marine foam and the vinly is 30 oz marine grade and UV stable. Mounting hardware included.