FCS Q-PC5 Quad Fin Set. A lightweight high performance quad set. Featuring a PC- 5 in the front and G-XQ in the rear. The G-XQ was designed specifically for quads and has an 80/20 foil to maximize the efficiency of the fin allowing for use across a variety of toe angles in quad set ups. Front- Base: 4.37" 111.0mm; Depth: 4.55" 115.0mm; Area: 14.76" 9525mm; Sweep: 33. Rear- Base: 3.86" 98.0mm; Depth: 3.93" 100mm; Area: 11.07" 7140mm; Sweep: 33.2. FCS.