FCS Surfboard Leashes - FCS Regular Calf SUP Leash - 10ft 0 :: Unisex > Surf Accessories. Length: 10ft 0Durable polyurethane cord provides the ultimate in strength. stretch and elasticityInterchangeable smooth rotating nylon cuff and swivel assemblyMachine stainless steel swivelsPerforms to the highest standard in a wide range of conditionsWave Size: 2 - 8ft and flat waterCord Thickness: 7mm Size: one size.