Even wall thickness for maximum strength and durability Molded -in ribs for strength and abrasion resistance Designed for medium - duty use in both permanent protected and unprotected moorings Unique Polyform valve for years of service Use with boats 20' - 30' in length Polyform 15460041 HTM Series Fender - 8.5' x 20.5', Burgundy SKU: 3006.5638 UPC: 743952004268