Bounce House Birthday Thank You CardsBounce House thank you cards feature a cute bouncy castle and colorful polka dot and striped background. 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 they are the perfect size for a quick thank you card