This fin set is recommended for fish, funboard and twin fin boards. It has a lower sweep (rake) than most conventional, wider based keels which allows it to pivot in a really tight radius. It’s 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. Please Note: this fin is designed to be used exclusively with the FCS II Fin System, and will not fit in the traditional FCS Dual Plug System.