Captain Fin Co Jeff McCallum Keel Fin

No, these fins are designed for the original FCS 1 system. While they will fit into FCS II boxes with the use of grub screws, they are not designed for the tool-less FCS II click-in system.

The flat foil provides a traditional, predictable feel that is highly responsive. It is ideal for surfers who want a classic, reliable ride with a clean release during turns, rather than the added lift or hold found in foiled or specialized performance fins.

These are specifically engineered for retro twin-fin fish shapes. Because of their large surface area and significant rake, they will likely feel too stiff and draggy on a modern performance shortboard designed for thruster setups.

They excel in point breaks and open-faced waves where you can utilize the large surface area to generate speed and draw out long, carving turns. They provide the most stability and drive in average to good conditions rather than steep, hollow, or punchy surf.

Fiberglass is a stiffer, more durable material that prevents the fin from flexing excessively under pressure. This rigidity is crucial for a keel fin of this size, as it ensures the fin maintains its shape and provides consistent drive through bottom turns.