Learning Resources Alphabet Mailbox. This friendly post box is ready to help preschoolers learn their ABCs. Hidden inside the post box are 26 chunky, 2-piece double-sided puzzles. Find and match the upper- and lowercase letters shown on one side, and then turn them over to solve beginning sounds puzzles on the other size. Children can practise their writing skills on the write-and-wipe post cards and even apply one of the included reusable postage stamp stickers. Includes the mailbox, 26 x 2-piece puzzles, 5 post cards and a sticker sheet with 30 reusable postage stamp stickers. The Activity Guide and packaging are multilingual. Post box measures 22cm L x 15cm W. 62 Piece Set (Ages 4+)