Amscan Sunny Sesame Street Postcard Birthday Party Thank You Cards, Multicolor, 4 1/4" x 6 1/4" Features Big Bird, Elmo and Cookie Monster against a white background with colorful polka dots and a colorful "THANK YOU!" headline Printed on cardstock on one side so you can personalize your message at the back Thank you cards measure 4 1/4" x 6 1/4" Package includes (8) invitation cards, (8) envelopes and (8) matching "THANK YOU" stickers