FCS II Performer Neo Glass Tri Quad Fin Set - Medium. FRONT: Base: 4.37" / 111mm Depth: 4.55" / 115mm Area: 14.81" / 9554mm Sweep: 33.7 Foil: Inside QUAD REAR: Base: 4.09" / 104mm Depth: 4.26" / 108mm Area: 12.63" / 8150mm Sweep: 32.4 Foil: 80/20