Sparking imagination as kids stamp, sort, send, solve and pretend, this Melissa & Doug® Stamp and Sort Mailbox activity set engages young learners in hours of creative play! With six letters and six removable stamps, children can learn and match colors, sort letters into corresponding shaped slots, lock and unlock the play mailbox door with the wooden key, deliver letters around the house, create stories about the pictures on the postcards, pretend they work at the post office and much more. Kids mailbox measures 7 1/2" long x 7 1/2" wide x 13 1/4" high. Ages 3 and up. SMALL PARTS. Not for < 3 yrs.