FCS II Skindog Performance Core 7\" Longboard Single Fin - White A high performance centre fin designed by 11 x European Champion Ben Skinner. The up right centre finis built for speed and the aircore construction compliements his highly technical Thunderbolt signature range. No need for a plate and screw. Ability to adjust your fin position in the box mid surf. Easily insert or remove your fin in seconds. No fin key required. Designed to be used in most existing Longboard boxes. No new box required.