FCS GMB Green Flex Surfboard Tri Fin Set FCS GMB was refined with feedback from his Lost team riders A feel that is identical to traditional fiberglass fins, with a stiff base and responsive tip flex Features a lively combination of projection and maneuverability from Matt Bioloss' favorite templates PG fins are the perfect transition fin for surfers moving from glass-on fins to FCS The precision of the injection molding process ensures the highest accuracy in geometry in each fin produced