Released and stamped with the special First Day Issue cancellation mark (available only at the 2007 San Diego Comic Con itself, where the stamp also debuted), these official USPS stamps features The Incredible Hulk #1, Captain America #100, X-Men #1, and Fantastic Four #3 (all featuring Jack Kirby art!). In nm/mint condition, all four FDI's will be shipped with the utmost care.  Please note- buyer receives all four FDI's.