Our United States Navy Submarine Forces Patches are made from colorfast threads on heavy backing to keep their shape and good looks. Although most patches have an iron-on backing, we recommend that you sew them on for longer lasting results. These Patches make it clear that you or someone you know is proud to be associated with the Submarine Forces. These Patches measure approximately 4 inches. Your satisfaction is guaranteed, period. Usually ships within 4 - 7 business days.