Prosurf FCS Hexcore RTM Style Carbon/Honeycomb White and Black Surf Board Fins - Surfboard Fins for Sale 3pcs Set Shortboard Longboard FCS compatible fins Fast reacting fin for performing tight radius turns.Upright template with flat foil on the side fins allows for acute directional changes High quality thruster fins.Salt and Corrosive Resistant Fin Material: Fiberglass, honey comb, carbon, Fin Size: M, Base: 4.55 in / 116mm, Depth: 4.52 in / 115mm, Area: 14.89sq in / 9608sq mm Set of three (3) fins