Check out our Border Flat Card Collection! Designed to match ColorSeams envelopes perfectly, these flat notecards have a bold, single-tone printed border on the front. Pair your ColorSeams envelopes and flat cards today to make a statement that your guests will remember! Printed on 100lb. White, 100% recycled stock and available in 2 sizes ... A1 (3 1/2 x 4 7/8) and A7 (5 1/8 x 7).