FCS II Reactor fins are designed for tight turns and hollow conditions. These are size Medium for riders of 65-80kg and have the better, performance carbon core. Fins have a width of 110mm at the widest point and 116mm high, the rake on these is 31.9 degrees and they have a flat foil.
The FCS II fins are the latest offering from FCS. They don't need allen keys anymore as the fin boxes are equipped with a quick release spring pin. The advantage of these over the FCS I? If they do hit the bottom it does break the fin out and not the whole fin box.
NOTE-The board must be fitted with FCS II fin boxes for these fins to fit.