It's a postcard! It's a magnet! Write a message, affix a postcard-rate stamp, and pop in the mail. The delighted addressee then peels off the backing and has a 6x4 magnet to cherish forever and ever! Magnetic Postcards can be mailed at the standard USPS postcard rate. While they may not stand up to little Suzie's latest art project, they are plenty strong enough to hold their own on fridge or file cabinet.