Polyform USA G-Series inflatable fender. 4-1/2" diameter x 15-1/2" long. Color black. The Polyform G-fenders are blow molded from marine-grade Vinyl material. Intended to be used for typically light-weight utility fenders - but still designed with re-enforcing ribs along the length of the fender body - to assure added strength and abrasion resistance. Over inflation voids manufacturer's warranty.