(On back-order until 2/7/18) The Melissa & Doug Stamp and Sort Mailbox is the perfect way to provide your child with hours of fun and learning. The 3 different size letter slots and 6 different size letters and packages allow your child to learn how to sort based on size and shape. The 6 removable stamps also provide an opportunity to help your child learn how the postal service works as they prepare their special mail for the box. Mix and match stamps and letters for fun variations each and every time they play! Use the included wooden key to open the mailbox's special delivery door to remove the letters, postcards, and packages that have been dropped through the slots! Appropriate for ages 3 and up, this classic toy is sure to offer hours of entertainment!