Tuff End TM Inflatable Vinyl Buoys. Tuff End buoys feature heavy duty seamless construction to meet the punishing demands of the commercial marine industry. Tuff End fender ends are made from injection molded vinyl tested to 2000 psi tensile strength, the strongest in the industry! Tuff Ends feature large line holes that will accept standard shackles. The curved design hole prevents chafing. 21" diameter, 66" circumfrence, 1-1/2" line hole diameter, 180 lbs. buoyancy.