Our Blank Blue 4up Postcards make it quick & easy to print your very own postcards. These 4up postcards are made from a 110lb Index Blue Cardstock that is both Inkjet & Laser printer compatible. Measuring 8 1/2" x 11", this postcard paper is microperforated to break into 4 individual postcards measuring 4 1/4" x 5 1/2" each.