Dorsal Carbon Hexcore Thruster Surfboard Fins (3) Honeycomb FCS Base Blue DORSAL Carbon Core Thruster Surfboard Fins by DORSAL The FASTER....LIGHTER....TIGHTER Surf Fin The CS5 Series Ultra Light Carbon Surf fins are not only aggressive but have just the right amount of rigidity and slight flex to bring that surfboard alive, for the first time. These fins are made of the patent pending ultra light material that not only rides well but looks great too. These sets are made in the traditional G5 Style Template (Includes GX Template Trailers in Quad sets). - Compatible with FCS