Colour: Black/White Swirl * Fin Material: Performance Core * FIN SPECS * TWIN: * Base: 5.06" / 128mm * Depth: 5.55" / 141mm * Area: 21.06"² / 13590mm² * Sweep: 32.1º * Foil: Flat * STABILISER: * Base: 3.31" / 84mm * Depth: 3.34" / 85mm * Area: 8.23"² / 5307mm² * Sweep: 29.1º * Foil: Flat Premium speed and exceptional drive are what this FCS II MR PC X-Large Tri Twin Surfboard Fins in Black/White Swirl offers to you. These fins has a small stabiliser or centre fin which adds control whilst maintaining the freedom and manoeuvrability of a twin fin set up.