Scarfini FX2.5 Quad Medium Velox Futures Carbon Base Surfboard FinScarfini FX2.5 quad is a medium fin. Fits Futures fin boxes. The Velox is an upright and less curved template that maintains and generates hi-speed. Great fin for powerful conditions. Great option for control through critical sections yet with release on the top turn due to the upright template.See images for more info..