FCS II DHD Performance Core Surfboard Fins

No, the FCS II system is designed for tool-less installation and is not compatible with the older dual-tab boxes that require grub screws. You will need a board equipped with FCS II fin boxes to use these.

The Medium size is generally recommended for surfers weighing between 65kg and 80kg (145lbs to 175lbs). If you are on the lighter or heavier end of that spectrum, you might find the fin's flex pattern feels slightly too stiff or too loose, respectively.

Performance Core construction uses a lightweight resin transfer molding process, which creates a fin that is significantly lighter than solid fiberglass. This reduces swing weight in the tail, making the board feel more responsive and easier to maneuver through quick turns.

Yes, the tri-fin configuration is the gold standard for versatility. It provides a balanced feel that performs well in everything from punchy beach breaks to long, open-face point breaks, offering a reliable mix of drive and release.

One of the main advantages of the FCS II system is that it is entirely tool-less. You simply click the fins into the box, and the internal mechanism secures them in place, though you can still use a grub screw for extra security if you are surfing heavy, hollow waves.