FCS surfboard fins * Size: Large * Flat foil on side fins * Deep concaves * FCS II branding * FCS II Fin System compatible * Colour: White The FCS II CI surfboard fins look very similar to that of the Reactor. It is ideal for surfing in hollow waves and punchy beaches. It features a Performance Core construction that has a flexible pattern to allow surfers to sustain drive and maintain a turn. Channel Islands Surfboards teamed up to make punchy waves and speed when surfers are ready.