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The F-Series is a unique, strong, ultra light fiberglass contruction that delivers a performance fin for surfers who feel a little too much flex in composite fins and not enough in Carbon Lites. The progressive engineered flex is complimented by optimized asymmetric foil sections for maximum hydrodynamic efficiency. More speed, better response, increased acceleration, more hold and drive through carving turns and more fluid rail-to-rail. Base 4 3/8" 110 mm Depth 4 1/2" 115 mm