The perfect shallow waters solution! This 8’ Flex Fin fits Atoll inflatable stand up paddle boards and includes a fin screw. If you are concerned with the safety of your paddle board fin box use this paddle board fin. Children running around, rocks, hidden objects can all damage your fin and fin box. Damaged fin boxes can be difficult to fix, to avoid this use a fin a soft rubber fin that bends when impacted. This soft river fin is compatible with all stand up paddle boards that use a universal fin box.