This hand lettered card by Letters from Elliott is the perfect way to say thank you.
 
Blank inside
Size A2 (cards: 4.25" x 5.50" folded) 
Color - white background with dark grey lettering and coral heart
Brown kraft paper envelope included 
 
The greeting card and envelope are acid free and will not yellow with age.  The card and envelope will ship in a cellophane bag in a chipboard mailer to prevent any accidental bending or liquid damage that may occur during shipping.