Futures Fins Alpha Quad Fin SetThe F6 Honeycomb Quad is a Med size Balanced fin with a Ride Number of 5. 3. It's a high performance quad set suited for medium sized surfers or boards with boxes set closer to the rails, making this setup an excellent option for high performance shortboards with a little more tail area. The flat foil front and rear combined with the honeycomb material give this setup extra drive and response through turns.