Don't let the name postcards fool you! Yes, you can use them for postcards, but they also great for invitations (fit perfectly into an invitation envelope). signs, and notices, and more. I always keep a supply on hand. I like to use them to put small discreet signs around--either laminated or enclosed in a plastic card holder/frame. They are sturdy and make great eyecatching memo cards when you add a few graphics and enclose them in a package or shipment. Try these. You won't be disappointed!