HB, BFF! In case you’re not up on the latest lingo, that means “Happy birthday, best friend forever!” It’s what the kids call “text talk” (that's what we've been told, anyway). So if you want to send a kid a birthday card that they’ll find ultra cool, you need this die set that has a big HB for “happy birthday.” It also coordinates with the   All the Birthdays Stamp Set, which has even more really fun and cool birthday greetings for the kids—and adults—to make oodles of birthday cards. 4 pieces.