FCS II Modern Keel Performance Core Twin Surfboard Fins - WhiteThe FCS II Modern Keel PC Twin Fin Set is designed for traditional fish shapes. Lower sweep (rake) than most conventional, wider based keels which allows it to pivot in a really tight radius. Overview: Upright keel template designed for traditional fish shapes. Lower sweep (rake) than most conventional, wider based keels which allows it to pivot in a really tight radius. High area and depth not only delivers a feeling of control when pushed harder on