40 Holiday Stripes Printable Christmas Postcards These festive Holiday Stripes Christmas Post Cards are perfect for the Holidays! These festive Holiday Stripes Christmas Post Cards are 65lb cover. 4 cards to an 8 1/2in. x 11in. sheet. Each sheet perforates into four 5.5in. x 4.25in. postcards. Fits inside an A2 sized envelope (envelopes are not included). Includes 40 postcards.