Sea Dog Mooring SnubberSea Dog Mooring Snubbers are made of rubber and are excellent at keeping the tension off of your mooring or dock lines from wind, surf, or any other sudden pulls it may experience. The length of compensating movement can be adjusted by the number of line turns around the snubber mitigating the effects of wind and waves. Easy to fit they require no extra hardware. High quality rubber they resist sunlight, saltwater, and ozone. Ideal for use in tidal areas, on exposed moorings or in towing situations.Dimensions: 561512; A: 17-1/8"; B: 3/8"; 561516; A: 19-3/4"; B: 1/2" - 9/16"; 561520; A: 21-1/2"; B: 5/8" - 3/4";