Avery Ivory Postcards for Inkjet Printers, 4-1/4"x5-1/2", Pack of 100 (5919) Convenient do-it-yourself cards mean that you can make changes and print new postcards at a moment's notice Thick, sturdy cardstock holds up during travel through the mail Print only the number of postcards you need Compatible with both laser and inkjet printers Customize and print using free designs and templates