The FCS II AM PC Quad-Tri Fin Set is Al Merrick's signature template. Customize your board by surfing a quad set up when you need more speed or a thruster set up when you want to get radical in the pocket. The FCS II AM PC Quad-Tri Fin Set is a great all around fin set that provides more speed, flow, and stability. The FCS II AM PC Quad-Tri Fin Set is great in a wide rage of conditions. Surf anything from a fast hollow beach break to a long reeling point break. *Please Note: this fin is designed to be used exclusively with the FCS II Fin System, and will not fit in the traditional FCS Dual Plug System.