This stamp sheets features 40 new, mint never hinged stamps with a 45 cent denomination. The stamps are multi-colored and depict heroes of the 9/11 tragedy. The sheet was issued by USPS in the United States in the 2001-2010 period. The stamps are ungraded and uncertified, but are of high quality. This is a great addition to any stamp collection and a tribute to the heroes of 9/11.