Happy birthday to who? This clever watercolor features an owl on a stack of books and a mouse with a match. A charming, punny wish for the book lover. Make their day a little more magical. Featuring iconic watercolor art and hand-lettered greetings, these cards turn a simple birthday wish into a smile. Front: happy birthday to who? Inside: happy birthday to you! Single card 4.25 x 5.5 inches folded Soft white textured card stock and matching envelope, FSC® certified Made in the USA Case of 6