FCS II Harley Ingleby Quad Performance Glass Surfboard Fins - Large/SmokeHarley Ingleby's new HIBT 3+3 model has opened up a whole new world of fin configurations for surfers. When the accompanying Harley Ingleby Power Twin Set is purchased alongside this quad 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 twin fins are sold separately. To quote Harley, " Taking the versatility of the HIBT to