* FCS surfboard fins * Al Merrick thruster design * 3 Fins set * Size: Medium * Side fins, centre fin * Deep concaves * Performance core construction * Colour: Grey The new FCS II AM PC AirCore Thruster Surfboard Fins is a 3-fin set thruster with Al Merrick's design. These medium-sized fins are built for exception drive and quick release. It has a performance core AirCore construction, a material which is even lighter than fibreglass so that the fins are extremely lightweight and has a smooth quality to its texture. This fin set is made up of the side fins and one centre fin with deep concaves. This surfboard fins feature FCS detailing all over in a grey colourway.