FCS PC-5 Thruster Surfboard Fins - Medium A balance of speed, flow and response in a variety of conditions. Overview A balance of speed, flow and response in a variety of conditions. Lightweight performance fin with responsive tip flex and hydrodynamic foil on the side fins.   Ideal Conditions A wide range of conditions from beach breaks to point breaks.   Board Types All board types. Will fit the FCS II Fin System when used with grub screws and the FCS Infill Kit.