The 7" Single Fin by FCS is a full bodied template providing a stable and predictable feel.
This FCS Single Fin is compatible with your average single fin box and utilizes FCS II patent pending technology that eliminates having to screw in your fin.
Available in sizes 6" - 8". As a guide, if you are looking for a single fin for an 8ft board get the 8". If you are using trailer fins you can easily drop down sizes.