For a brother who loves chemistry or science, this is the card for him on his birthday. Using elements from the Periodic table to spell out the message Happy birthday 'Brother'. Fun and clever! Size: 135x135mm (5.3x5.3 in) The Card is blank for you to add your personal message. It comes with a white envelope and in a protective cellophane bag. If you have any questions or requests about this, or any of my other items, please don't hesitate to get in touch.