FCS II Harley Ingleby Twin Performance Glass Twin Surfboard Fins - RedHarley Ingleby's new HIBT 3+3 model has opened up a whole new world of fin configurations for surfers. When the accompanying Harley Ingleby HIBT Quad Set is purchased alongside this twin fin set, the following fin configurations are possible: Quad Twin Asymmetrical quad and twin. All these options are shown in the photos to illustrate the options. Please note that the quad set is sold separately. To quote Harley, " Taking the versatility of the HIBT