Reach everyone in your community in no time at all with our new postcards! Full-color postcards feature some of our most popular door-hanger designs and are standard-sized (4 1/4 inch x 6 in.) for convenient mailing. Full-color front, blank back. Sold in packs of 50. Ask people to hand write 5 or 10 postcards each and you'll find it's one of your best outreach tools ever.