Wishlist FCS FCS FK-2 Keel Fins | Twin Fin Set | Performance Core | Retro Style Surfboard Fins | Suitable For Fish Surf Board $120.00 FK-2 Keel | Twin Fin Set | Performance Core | FCS FK-2 Keel surfboard twin fins, 2 tab fish keel with 80/20 foil has less area and more flex than a traditional keel. This keel will add a little more manoeuvrability and freedom to any retro twin set... Choose Options Compare