[Product] Keel Fin Material: Wood core, fiberglass Compatible with FCS This fin has a classic and stylish look with a wood core and fiberglass construction. Suitable for twin fins, fish boards, etc. Comes with a soft case. Please refer to images 2 and 3 for the size. Thank you. Type... Fins Fin System/Fin Box... FCS Number of Fins... Twin Fin #Surfing #Surfboard #Fin #KeelFin #TwinFin #SurfGear #SurfGoods #Alternative