Center fin only. We are selling two of the same item. Everyone who surfs has experienced wipeouts, paddling, having the nose of their own or someone else's board fly towards their face, cutting their feet on fins, or damaging other surfers or boards. Hawaiian local DAVID, who surfs on coral reefs, established Surfco Hawaii 25 years ago based on his experiences witnessing various serious injuries, with a focus on safety. Power Flex Fins 4.25" FCS [75A] The core itself has flex, generating propulsion with a spring-like return force during turns. COLOR: CLEAR SIZE: 4.5inch FIN SYSTEMS: FCS