This is a great optical illusion. Carefully cut out the two boomerangs. If you hold them one above the other, the bottom one will always appear to be larger. Rub one on your sleeve, then reverse the positions, and they will appear to change sizes! We customize this with your name, phone number, website or any other information you would like to include. Printed on 14 pt cardstock with aqueous coating. You get 1000 postcards.