The FCS II Mayhem Pivot Quad Rear Fin Set is Matt Biolos' refined quad rear template for speed, tight turns and quick changes of direction. Part of the Reactor fin family, it adds agility and responsiveness to lower-rockered boards like the RNF and Puddle Jumper, and still performs in high-performance quads.
| Fin system | FCS II |
| Setup | Quad rears (2 fins) |
| Construction | PC Carbon |
| Sizes | Medium, Large |
| Colors | Sand, Marine |
As a general guide by surfer weight: Medium about 145–175 lb; Large about 165–200 lb. If you're between sizes, size up for more hold or down for a looser feel.
Will these fit my board? They fit boards with FCS II fin boxes. They won't fit original FCS two-tab plugs or Futures boxes.
Does this include front fins? No, this is a set of two rear fins. Use them with the side fins from a matching tri set, or a quad front pair.
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