The Confetti Birthday Cake Greeting Card Puzzle from Galison is a 60-piece postcard puzzle featuring a deliciously looking birthday cake. Package comes with the puzzle fully assembled. Write the message on the back, break up the pieces, place in the envelope and mail. The ultimate birthday surprise! A greeting card and puzzle in one! Size: 5.5 x 7.375 x 0.375″, 140 x 187 x 10 mm 60 Piece Puzzle Sticker Seal Colored Envelope