Futures Scimitar Alpha Rear Quad Fin SetThe Futures Fins Scimitar Alpha Quad Rears Fin Set are designed to pair with the Alpha Vector 3 2 front fins, to be ridden as a quad set. They feature the flattened Scimitar tip on the trailing edge to keep the turning arc tight and a flat inside foil that enhances lift and release when ridden as a quad. Sold as a pair (left + right fins) to fit Future's shallow depth fin boxes. Fin Size Detail Height Base Area Foil Rear Fin 4. 01" 3. 94" 11. 25" Flat