Wise 8WD135 Series Pro-Style Folding Seats Are Built with Plastic Injection Molded Frame with Removeable Seat Cushions. High Compression Foam Padding and Marine Grade UV and Mildew Treated Vinyl. Embossed Vinyl Seating Surface. Mounts to any BIA Standard 4 Bolt Pedestal. Seat Dimensions - 18" Height, 19.25" Width, 20" Depth, 15.25" Seat Depth. 6 Year Warranty on Frame, 3 Year Warranty on Upholstery.