FCS II Harley LB Quad

These fins are specifically designed for the FCS II fin system. If your board has the FCS II boxes, they will click in without screws. If you have traditional dual-tab boxes, you will need to use screws to secure them.

This set is built for powerful surfers who want speed and drive. The XL template and progressive flex pattern are designed to help you maintain hold through aggressive turns, making it ideal for performance longboarding or stand-up paddleboarding.

The FCS II system uses a molded-in barrel that locks the fin into the box with a simple click. You don't need any keys, plates, or screws, which makes it easy to swap fins or adjust your setup right on the beach.

Performance Core construction uses a multi-layered resin transfer molding process. This creates a consistent, progressive flex pattern that feels lively and responsive, providing a balance between stiffness for drive and flex for control.

While technically possible if your board has FCS II boxes, these fins are specifically templated as an XL set for longboards and SUPs. They will likely feel too large and stiff for a standard shortboard, which usually requires a smaller, more maneuverable fin profile.