Original Futures Finbox ½ Inch for center fins.½ Inch (1,27 cm) deep.Futures is proud to make one of the lightest and strongest fin system in the world! Our proven full-base system now features Interwoven Laminate Technology (ILT). These cut outs in the flange create an even stronger bond to the skin of the board by allowing the resin to weave itself between the surfboard and fiberglass skin.