Futures Fins Fin Box Filler Plug Set are designed to be placed into empty fin boxes when not in use. This most commonly occurs when riding a 5-Fin setup as either a thruster or quad, since all 5 boxes are not utilized at the same time.
1/2″ fit Futures center fin and quad rear fin boxes
3/4″ fit Futures front side fin boxes of a thruster, quad, 5-fin or 2 + 1 set-up
