FCS II Lost MB Surfboard Fins

No, these fins are designed specifically for the FCS II fin system. While they are backward compatible with older FCS dual-tab plugs if you use grub screws, they are optimized for the tool-less FCS II boxes.

This set gives you the flexibility to adapt to different wave conditions. You can run a thruster setup for more pivot and control in punchy waves, or switch to a quad configuration for increased speed and drive down the line in down-the-line or mushier conditions.

The carbon construction makes these fins significantly lighter and stiffer than standard fiberglass or plastic fins. This results in a more responsive, 'lively' feel that snaps back quickly out of turns, making them ideal for high-performance surfing.

FCS generally recommends the Medium size for surfers weighing between 65kg and 80kg (145-175 lbs). If you are on the heavier side of that range, you might find them a bit loose, while lighter surfers might find them slightly stiff.

No, that is the main benefit of the FCS II system. You can insert and remove the fins by hand without needing a fin key, which makes swapping between thruster and quad setups quick and easy right at the beach.