FCS II AM PC Medium Grey Tri-Quad Retail Fins. FeaturesAl Merrick's medium size signature fin. Merrick's template has a high degree of sweep with a narrow elongated tip. Flat foil side fins, smaller centre fin (medium size). Performance Core Designed for radical, progressive surfing. Produces exceptional speed and drive, smaller centre fin offers quick release through turns. A wide range of conditions from beach breaks to point breaks. Recommended for boards with deep concaves and moderate-to-extreme rocker.