Makai Nine-Oh Single FinMultifunctional Versatility. The Nine Oh is a choice option for surfers wanting a nimble fin for maximum turning and performance. Its a constant turner, and really frees up your board to allow easier maneuvering. Fun fin fitted for mid lengths to logs and 2 + 1 options. And Oh, by the way, the principal called and said it is 1 + 2, not 2 + 1. The 1 came before the 2, right? Either way you call it, it works! Modified in the 1980s the base is set to 5.