About FCS SouthAfrica After a decade of R&D, FCS has emerged as the lightest, simplest, strongest and most reliable fin system ever developed. In fact, FCS has become a world standard for the surfing industry. FCS (Fin Control System) has revolutionized surf travel and provided greater freedom in experimentation with fin size and fin number. A small key loosens and tightens each fin via glassed in plugs. The fins can be removed for travel (fins are often damaged when surfboards share airplane space with common luggage). Also, when surfing different conditions or when tiring of the performance of an old board, fins can be exchanged for different sizes or even left out all together. It's fun to switch to a twin-fin in tiny conditions. Be sure to ask for FCS fins if you are ordering a new board if not for the reasons already mentioned then for the fact that the composite molded fins bend when needed but remain strong. At FCS we are committed to enhancing the surfing lifestyle.