Send birthday wishes or a cute party invite with the Party Palooza Clear Photopolymer Stamps by Heffy Doodle. The package includes 23 photopolymer stamps on a 4" x 6" storage sheet. The stamps are made in the USA and can be used with an acrylic block and inks of your choice (sold separately). The set features images including a birthday cake, a cupcake, gifts, pizza and expressions including "happy birthday", "party" and more.