Injection molded seats with interlocking hinges for greater structural support. Extra wide seat for all-day comfort. Durable injection molded black plastic frameInterlocking hinge designed for added structural integrityUniversal mounting bolt pattern: 5" x 5"Marine-grade vinyl is UV-treated, mildew resistant, and water-resistantWarranty: 5 Years Substrate/Frame, 1 Year Upholstery/Cushions