FCS II Reactor Performance Core Quad Rear Twin Surfboard Fins - Medium/CharcoalThe FCS II Reactor PC Quad Rear Fin Set are made for speed & tight turns. Ideal for beach breaks. Features: Designed for speed and tight turns, with added tail release. Upright template allows for tighter, more acute directional changes. Smaller centre fin for increased pivot and tail release. Ideal for surfers who like to perform fast, progressive turns. Quad Rear (2 fin) set. Wave Type: Suitable for hollow waves, particularly good for beach breaks.