Original Signed & Dated on the back ATC = Artist Trading Card ACEO = Art Cards, Editions and Originals Size: 3.5 x 2.5 Same size as other trading cards such as baseball, footbal and pokemon. The swirly is done on 90 lb. cold press watercolor paper using Bic permanent markers and Windsor & Newton watercolors. COA comes with your ACEO. You will receive your miniture art in a soft & rigid protective sleeve. That will be put into a white bubble mailer. To protect it while it is on its way to you. I love the flow of the swirls and the rainbow colors. It is like your own personal pocket rainbow!