This Dock Box is manufactured from heavy duty, high density, white fiberglass laminate for added rigidity. It has a 20-mil layer of gel-coat protection for durability and long lasting beauty. The smooth, glass-like, gel-coated outer finish and tinted interior combine to make a clean, great looking Dock Box. The extra-tough sandwich core lid construction, unlike the weaker plastic models, allow safe, adult seating. Only the finest marine grade hardware, including front mounted hasps that incorporate locking rings, is used.