AM Twin fin with mini stabiliser. Lowest area twin set in the FCS range. Overview Lowest area twin set in the FCS range. The low sweep (rake) and narrow tip means these fins pivot and release exceptionally well, while maintaining incredible trim speed and the ability to quickly break into a turn. Mini stabilizer has a narrow, elongated template with a rounded tip to add control when driving through turns. 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 molding 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.