FCS II Harley Ingleby Power Twin Performance Glass HIBT Twin FinsHarley's new pro model twin set designed for use in the HIBT 3+3 model. Overview Harley 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