Affordable, dual purpose Stand Up Paddle Board fin. - Ideal for flat water; from open ocean to lakes and inland waterways. - For use in race, flat water and surf. - Streamlined design for increased maneuverability. - Seamless leading edge to quickly shed weed. The FCS II Tool-Less System - 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 boxes. No new box required.