The FCS II SUP Tour 9" Race Fin is a brand new design from FCS. Featuring the new "FCS II" quick-interchange sytstem, the new SUP Tour requires 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 inserted 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.