The FCS II GF SUP Fins are a brand new design from FCS. Featuring the new "II" quick-interchange sytstem, the new GF fins require no tools for installation or removal. The new system is constructed using a compression-fit rod and barrel system that snaps into place rather than having to be screwed in. When the fin is insterted into the box, the barrel sits in the groove detail of the box, locking it into place using a combination of downward and lateral force. This new system is backwards compatible with older FCS fin boxes. Available in 7" and 9" models.