The FCS ARC Fin (large) is designed for lighter surfers looking for a fast and lively fin. Exceptional drive with the ability to make fast directional changes in critical parts of the wave. The raked side fins produce exceptional speed and drive, while the smaller center fin offers quick release through turns. Comes with three fins and a fin key.Performance Core material and construction is designed to deliver the feeling of a traditional fiberglass fin with the added performance of reduced weight. 4.37" base and 4.37" depth.