Dockmate Hole-Through-The-Middle-Fenders are designed with vertical ribs for more strength, extra thick walls for resistance to punctures and tears, and reinforced tube ends for better hold on lines. The center tube fits up to 5/8" dia. rope and lets you hang these fenders vertically or horizontally. The unique Dockmate rubber valve allows easy inflation with a standard sports ball needle. Come pre-inflated for convenience. Guaranteed against bursting and splitting for the life of the fender. Guaranteed against bursting and splitting Pre-inflated for convenience Easily adjust pressure with sports ball needle | UV Protected Hole-Through-The-Middle Fender, 8" x 20" in White