Blue Snowflakes Printable Holiday Postcards - 80 Pack These lovely Blue Snowflakes Printable Postcards are perfect for the Holidays! These lovely Blue Snowflakes Printable Holiday Postcards are made of 65lb cover. There are 4 cards to an 8 1/2in. x 11in. sheet. Each sheet perforates into four 5.5in. x 4.25in. postcards (which can be used with A2 envelopes -- envelopes are not included). Includes 80 postcards.