Blue Dinosaur Birthday Thank You CardsDinosaur thank you cards feature colorful dinosaurs and a fun striped background. With colors of blue, green, orange and red, it's a fun way to send your thanks. Some features of our thank you cards: Professionally printed on 80# cardstock paper so you feel the quality. Teaches children how to send a meaningful handwritten note Easy to use because all you have to do is simply fill in and mail out 10 cards and 10 white envelopes included 4. 5" X 5.