JS Industries FCS II Power Twin Stabiliser

The stabilizer fin adds a touch of control and predictability to the loose, skatey feel of a traditional twin fin. It provides just enough hold to keep you stable through turns without sacrificing the speed and fluid maneuverability that twin fins are known for.

These fins use the FCS II system, which is designed for tool-less installation. They are compatible with any board equipped with FCS II fin boxes, though they are specifically optimized for fish, funboards, and dedicated twin fin shapes.

This set is highly versatile and excels in a wide range of conditions, from small, mushy days to clean, down-the-line waves. The extended base provides plenty of drive for generating speed in weaker surf, while the moderate sweep allows for responsive turns when the waves pick up.

While these fins are high-performance, they are quite forgiving due to the added stability of the center fin. They are a great choice for intermediate surfers looking to transition from a thruster setup to something faster and more fluid, or for anyone wanting to experiment with a twin-fin feel.

You don't have to, but it is recommended. You can certainly ride the board as a pure twin fin if you want a looser, more traditional feel, but the stabilizer is specifically engineered to balance the set and provide extra control during aggressive maneuvers.