Avery Postcards for Inkjet Printers, 5.5 x 4.25 Inches, White, Box of 400 (8577) Convenient do-it-yourself cards mean that you can make changes and print new postcards at a moment's notice Thick, sturdy card stock holds up during travel through the mail Design and print postcards from your desktop in minutes Print only the number of postcards you need Compatible with inkjet printers