Futures Controller Split Keel Quad Surfboard Fins - XL/BambooThe Futures Controller Split Keel Quad Fin Set has a skatey feel to the set, similar to a twin keel, but with more control. The Controller is a split keel quad setup designed specifically for use in wide tail fish designs. The honeycomb & bamboo construction, V2 foil and large surface area are great for generating speed and maintaining it through a sequence of turns. With the upright positioning of the quad rears, there is a skatey feel to the set,