True Ames - Fantastic Acid PMH 9.9" - VolanOverview The Fantastic Acid PMH Fin is Tristan Mausses preferred flex fin, purpose built for maximum performance on convex bottom boards. Its narrow base and low drag outline are designed for deep, rail engaged bottom turns and fluid, drawn out lines. A slightly thicker foil through the mid body enhances controlled flex, creating a responsive yet stable ride. Expect smooth transitions, effortless highline trim, and exceptional projection out of turns.