FCS Surfboard Leashes - FCS Regular Calf SUP Leash - 9ft 0 :: Unisex > Surf Accessories. Cord Thickness: 7mmInterchangeable smooth rotating nylon cuff and swivel assemblyLength: 9ft 0Performs to the highest standard in a wide range of conditionsMachine stainless steel swivelsDurable polyurethane cord provides the ultimate in strength. stretch and elasticityWave Size: 2 - 8ft and flat water Size: one size.