ACEO is short for Art Cards Editions and Originals. That's what these are. The same size as trading cards, 2-1/2" x 3-1/2", these little bits af art will brighten your day. They come in archival, UV protected acrylic case, with a hanger, table easel, and refrigerator magnet. Your choice just $15 each. Be sure to check back from time-to-time as new ones are added.