FUTURES K2 GLASS TWIN KEEL - BROWN / GREYFUTURES K2 GLASS KEEL BROWN GREY $159. 95 DESCRIPTION The K2 Fiberglass Keel fin is a smaller, more refined version compared to our traditional Keel fin. The K2 Keels fiberglass material offer minimal flexibility and maximum stability while the smaller template gives this fin a more high performance feel while maintaining the classic Keel fin ride. Dimensions Side Fins: Height: 4. 63" Base: 6. 34" Area: 22. 25" SKU: 1520 275 20 Weight: 300 Grams