Escape Room Birthday Thank You CardsEscape Room thank you cards feature the cyber lock to convey the adventure that awaits as you try to escape. They are an adventurous 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. 5"so