Our Blank Heavyweight White 4up Postcards make it quick & easy to print your very own postcards. These 4up postcards are made from a Heavyweight 80lb Cover White 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.