The default image size  this download is 5 x 7 inches or 12.7cm x 17.78cm.

This size is perfect to send using a standard stationery envelope at minimal cost.  If not able to print directly, why not forwarding on a solution, such as to Ryman's or WH Smith here in the UK for card printing.  If my memory also serves me corectly, individual high quality envelopes with a varietly of colours can also be found at Paperchase.

If home printing, any card gauge from 280gsm to even 400gsm will work.  the card is best cut along the trim marks with either a craft knife or scissors.  likewise, the card can be scored lightly with a scissors and ruler.

Click Here to test print this card: