Made from super elastic isoprene natural rubber. Our NEW design eliminates the self-locking internal systems, which caused unnecessary stress on the dock lines. These LineSaver Mooring Snubbers prevent mooring line breakage along with compensating for sudden jolting and excess stretching of lines beyond parting strength. Made from super elastic isoprene natural rubber, the LineSaver also provide maximum protection against the stress caused by wind, waves, and wakes. Absorbs dock line loads and increases dock line life. NO tools needed to install.