Liquid Force Dock Ties are designed to hold your boat securely with just a little give. 4ft in length with integrated bungee. Works great with the Liquid Force Boat Defender. 
Two types available as follows -
Liquid Force 4' DLX Dock Tie Product Features:-
A Stainless Steel Spring Clips
Super Strong Tubular Webbing Construction
Multi-Position Design for 2' and 4' Lengths
Oversized End Loops Built-in Float