Halloween Ghost Booth-day Thank You CardsHalloween Ghost thank you cards feature adorable ghosts and a haunted house. These are a perfect way to thank your guests for coming to your boo thday celebration! 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 hand written 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.