Children learn uppercase and lowercase letters, explore beginning sounds and more with this preschool Alphabet Learning Mailbox with 26 double-sided letter puzzles. Match the 26 letter puzzles, explore beginning sounds, practice writing skills and more. Five double-sided, write-and-wipe postcards help children practice tracing, pencil grip and other early writing skills. Add a colorful piece of postage to every letter with 30 reusable puffy, sticker stamps depicting common vocabulary words. When playtime is done for the day, return the pieces to the mailbox for easy cleanup.