The FCS II Harley Ingleby HIBT Quad Fin Set pairs the Reactor Large thruster template with Performer Large quad rears to support tight pivotal turns or smooth predictable speed depending on the chosen setup. Built for the HIBT 3 plus 3 system, this set becomes part of a modular design that enables quad, twin, and asymmetrical configurations when combined with the Harley Ingleby Power Twin Set, sold separately. The fins use PC AirCore construction and suit mid lengths, hybrids, and performance boards with deeper concaves and stronger rocker, all within the FCS II system.
Fin Size Detail
| Fins | Depth | Base | Area | Sweep | Foil |
| Front | 4.70″ | 4.45″ | 16.03″² | 32.0° | Flat |
| Center | 4.54″ | 4.40″ | 14.80″² | 32.4° | 50/50 |
| Rear | 4.26″ | 4.09″ | 12.63″² | 32.4° | 80/20 |
