The FCS system (Fin Control System) is a fin system on surfboards that allows the interchanging of surfboard fins. FCS systems can have a five-fin setup, known as C5, as well as tri-fin designs. Fins are inserted into slots in the board that are then secured by tightening set screws with a fin key. FCSfins are designed to break off in a collision, thereby reducing chances of damage to the board or injury to the surfer.
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