Overview Mark Richard's famous twin template produces exceptional drive and speed. The small stabilizer (centre fin) adds control whilst maintaining the freedom and manoeuvrability of a twin fin set-up. Board Types Designed to fit the FCS II Fin System. Recommended for all board types including fish, funboard and twin fin boards. Performance Core Performance Core (PC) fins are made using a multi-layered resin transfer moulding process. The flex pattern in PC fins extends progressively from the base through to the tip, helping the surfer to maintain drive and hold through a turn. This versatile fin material is light and can be used in a variety of different conditions. Medium - Large Fin Base (inches) Base (mm) Depth (inches) Depth (mm) Area (inches) Area (mm) Sweep Deg° Foil Side 5.06 128.4 5.56 141.1 21.06 13590 32.1° Flat Centre 3.31 84.0 3.34 84.8 8.23 5307 29.1° 50/50