Send joy in an envelope with this innovative and interactive birthday card! Once the recipient threads the string through the holes in the card and pulls, the little triangles separate and line up in the right order to spell "Happy Birthday!" on a mini hangable banner. It's a memorable way to celebrate the occasion and sure to be a keeper.   Comes with a large pearlescent white envelope for mailing. Also includes a sparkly silver string with aglets (cut just the right length for the banner) in a small glassine envelope.