The card should be printed at 100% on letter sized (8.5 x 11) paper. Trim the card using the crop marks and fold in half. The final size is 4.25″ x 5.5″. I printed my sample on red card stock to give it a little more XOXO. The cards will fit in a standard A2 (4-3/8″ x 5-3/4″), however if you do not have an envelope handy you can refer to my Recycled Paper Envelope to create one.