Sunblooms Correspondence Cards Author:Amy Butler Sunblooms Correspondence Cards by Amy Butler measure 5-1/8 x 6-3/4 in and include 20 cards (4 designs, 5 of each) and 20 envelopes. The Sunblooms Correspondence Cards are sunny flat notecards which are perfect for thank-yous, impromptu invitations, or quick hellos.