Futures En Fiberglass Surfboard FinsThe EN Fiberglass Twin is a large sized twin fin, offering that classic twin fin feel. Its a versatile option for multiple board designs that throwback to the 70s and early 80s. The fiberglass material combined with a wide base and extra tall height gives this fin maximum drive, while the thinner tip allows for just the right amount of flex for maneuverability. Template Category Neutral (all around versatile) Construction Fiberglass Suggested Wave