FCS Surfboard Fins - FCS II Reactor Performance Core Carbon Large Tri Fin Set - Purple :: Unisex > Surf Accessories. Designed for surfers who like to stay tight in the pocket and perform aerial manoeuvresUpright template with flat foil on the side fins allows for acute directional\n changesFast reacting fin for performing tight radius turnsPlease Note: Designed to be used only with the FCS II Fin System. it will\n not fit in the traditional FCS Dual Plug SystemIdeal Conditions: Suits hollow waves and punchy beach breaksBase: 4.45\ / 113mmBoard Types: Recommended for performance shortboards with moderate-to-low\n rockerRecommended Rider Weight: 75kg - 90kgFoil: FlatSweep: 31.9°Depth: 4.68\ / 119mmArea: 15.73\² / 10150mm² Size: one size.