From the Dr. Seuss Classic Book Characters Party Supply Collection. Dr Seuss Classic Book Characters Thank You Cards. Features Horton, the Kids from the Cat In The Hat book, Yertle the Turtle and Yellow Fish Green Fish and reads "A super stoo-pendous thank you!" on the front. Each package includes 8 thank you notes and 8 envelopes. Thank you notes measure 4.75" high x 5.75" wide when folded. The inside features light blue lines for writting your thank you notes with a Sam and Sams Friend image to the side. This product is officially licensed by Dr. Seuss Properties™ ©Dr. Seuss Enterprises, L.P. All Rights Reserved.