Mooring Snubber, Line Master. These snubbers stretch to more than twice their length, if necessary, to absorb shock loads and protect boats, cleats and lines from the strain of wind and waves. Highly resilient EPDM rubber is resistant to sunlight, salt water and ozone. It will never discolor or damage a boat. Unique, injection molded nylon locking system provides 100% safe and secure locking of the line with no hardware required. The harder the line is pulled, the tighter the grip. no slipping ever. Easy to fit, variable resilience. Keeps boats stable when moored, ideal for overnight trips. Unprecedented 5 year warranty.