Avery Printable Cards, Laser Printers, 100 Cards, 4 x 6, U.S. Post Card Size (5389) Printable cardstock lets you design and print your own customizable cards White 4 x 6 blank cards feature ultra-fine perforations for clean and easy separation; meets USA postal regulations for post cards Optimized for laser printers for jam &amp; smudge-free performance, guaranteed. Double-sided printing lets you add text and images to both sides. Customize these printable cards with your own design or choose from thousands of free templates and designs at avery.com/templates Perfect for RSVP cards, decorative postcards, thank you cards, invitations, sales &amp; marketing collateral, moving announcements and save-the-date announcements