FCS Surfboard Leashes - FCS Big Wave Ankle SUP Leash - 7ft 0 :: Unisex > Surf Accessories. Interchangeable smooth rotating nylon cuff and swivel assemblyCord Thickness: 8mmMachine stainless steel swivelsDurable polyurethane cord provides the ultimate in strength. stretch and elasticityExtended overmould keeps coil away from feet and prevents tanglingBig wave specific performance and strength. designed to match the demands of big\n wave surfingLength: 7ft 0Expandable coil allows unrestricted movementWave Size: 2 - 10ft and flat water Size: one size.