These Vietnam Veteran Doobers go on the size adjustment band on the back of your ball cap. A clever way to deliver your message to anyone behind you! These Doobers are a great way to show that you are a Veteran. Or, they make a great gift for that special Veteran! These Doobers measure approximately 1 x 3 inches. Your satisfaction is guaranteed, period. Usually ships within 3 - 5 business days.