FCS Flow Screw and Plate Performance Glass Single FinDrive hard off the bottom and perform controlled flowing turns. Overview Drive hard off the bottom and perform controlled flowing turns. Neutral fin with elongated base. Provides excess drive and hold for longer turns and trim stability. Suited to a more laid back style of longboarding. Designed to be used as a single fin. Performance Glass (PG) fins are machine cut from layers of solid fibreglass. These fins are stiff and are widely used by pro level