Future Fins FK2 Fiberglass Keel Twin Fin Set Brown-GreyThe K2 Fiberglass Keel fin is a reduced, more refined version of the traditional keel design, catering to smaller boards and lighter surfers. The K2 Keel is made of solid fiberglass offering stability and control at top speed. The smaller template offers a high performance feel or that classic glide and trim of the keel, depending on your style preference.