Polyforms F Series fenders offer the size, strength and dependability to protect vessels from the rigors of the sea and weather. F Series features unique one-piece construction with even wall thickness for maximum strength and durability.Twin-eye design hangs vertically or horizontally.Multiple ribbed reinforced ropeholds for the most demanding applications.Designed for use in permanent unprotected moorings, pilings, locks and concrete walls.Unique vinyl valve seals securely.Eye diameter: 1" dia.F-10 Fender is for boats 60' to 70' in length.