The USPS 2021 Message Monsters Forever Stamps Sheet of 20 features a fun and colorful cartoon design filled with various monsters and characters. This vintage-inspired trading card set is a collectible item that showcases original artwork in English language. Manufactured by USPS, this non-sport trading card set is a limited print run for the year 2021, making it a sought-after item for collectors. Each stamp is stamped with the official USPS logo, adding to its authenticity and value as a unique piece of postage art.