JS Industries Power Twin

These fins are designed specifically for the FCS II fin system. As long as your board uses FCS II boxes, they will fit perfectly without the need for screws or tools.

These are designed for twin-fin setups. They work exceptionally well on fish, funboards, and dedicated twin-fin boards that need a bit more drive and speed without losing that loose, responsive feel.

The lower depth is intentional; it reduces drag and makes the board feel much looser and more maneuverable off the top. While you lose a tiny bit of hold compared to deeper fins, you gain significant speed and the ability to make tighter, more aggressive turns.

While these are built for speed and maneuverability, the longer base provides a surprising amount of stability. They are reliable in critical sections, but they are primarily engineered for performance surfing rather than holding a long, drawn-out line in massive surf.

The high area design is what allows you to push hard through turns. It provides the surface area needed to generate drive and hold your speed through aggressive maneuvers, ensuring you don't slide out when you really lean into a turn.