Send out super stoo-pendous thank yous! Great for birthday party supplies, these thank you cards help complete a picture perfect Dr. Seuss theme. To bring to life a celebration so wow-worthy it would even make the Cat in the Hat stop in his tracks and the Grinch grin, shop coordinating tableware, invitations and decorations on this site! Includes 8 notes and 8 envelopes. Paper. 5 1/2" x 4 1/2" ™ & © Dr. Seuss Enterprises, L.P. All Rights Reserved.