Blank Postcard Paper - 4up Style - Thick 80lb Cover - 100 Sheets/400 Postcards Blank White 4up Postcards for Printers - Print Customized Postcards from your Home or Office Printer Made from a Heavyweight 80lb Cover Cardstock & Works with your Inkjet or Laser Printer Microperforated to break apart easier and leave cleaner edges Sheet measures 8 1/2" x 11" - Postcards measure 4 1/4" x 5 1/2" - Yields for postcards per sheet Compatible with most design software - Uses the standard 4up Postcard layout