Avery® Postcards - 97 Brightness - 5 1/2" x 4 1/4" - Matte - 200 / Box - Perforated, Heavyweight, Rounded Corner, Jam-free, Smudge-free, Double-sided, Uncoated, Recyclable, Biodegradable - White Create invitations, announcements and reminders using printers. Heavyweight, letter-size cardstock feeds automatically from a paper tray. Ultra-fine perforations let cards separate easily and cleanly. Avery offers many easy-to-use templates for Microsoft Word and other popular software programs. Weight meets federal postal standards.