Prosea SL01S Soft and Elastic Material Surfboard Leash with Double Copper Swivel Surfing Leash Diameter &Phi; 5.5mm and 6ft long 1)Engineered POLYURETHANE cord powerful, soft and elastic cord 2)Machine double COPPER swivels 3)Smooth rotating nylon cuff and rail saver swivel assembly 4)MULTIPURPOSE-Useful for surfboard and long board