I am not Kelly Slater so these fins are perfect for me for any condition! I used to have soft flex fins as a beginner, but these fins give me much more control. And they look great! Would definitely purchase them again!
Replacement fins for FCS II Performer Tri & Quad sets in all materials.
Replacement fins for FCS II Performer Tri & Quad sets in Softflex, Glass Flex, Neo Glass, Performance Core & PC Carbon.
How to identify your missing fin
Turn your board upside down, and stand at the tail. Diagram below:
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Adding this inexpensive smaller third fin to my thruster set loosen up my board and added more drive at the same time.