Authentic Harry Potter Party Supplies. 16 Blank Puzzle Cards with Envelopes. The package says Valentines - but these do not say Valentines anywhere -they are blank and would make PERFECT party invitations! Each is a 20 piece puzzles - you write on them and then break up the pieces and put them in the envelopes for the recipient to reassemble to get their message! Package includes 16 puzzle cards with 16 non-mailable envelopes featuring Harry on his Firebolt Broom from the Goblet of Fire. The completed puzzle card measures 5" square.