FCS II MODERN KEEL TWIN FIN SET - WHITE MARBLE (AIR-CORE)MODERN KEELTWIN FIN SET WHITE MARBLE (AIR CORE) 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 the open face, but helps to maintain tremendous speed through roundhouse cutbacks. White in new PC AirCore material. Designed to fit the FCS II