The New FCS II Performer Keel PG Fins Flux Specialty Series M-L is a high-quality set of surfboard fins designed by acclaimed surfboard brand FCS II. These M-L size fins are specifically tailored for surfboarding enthusiasts who are looking for optimal performance and control on the water. With a keel design and Flux Specialty Series technology, these fins provide excellent stability and maneuverability, making them a popular choice among surfers seeking a competitive edge in their surfing experience.