100% fabric, 100% mail-able--send a postcard they won't forget! Even better, this unique piece of mail lives on as a mug rug! Each Feeding Pickle Ltd fabric postcard is 4" by 6" and comes with a clear plastic envelope and brown paper envelope. Have it hand-stamped in the clear envelope and send it on its journey from the post office, or tuck the fabric postcard into the addressed paper envelope, stamp, and mail from the convenience of your home mailbox. Either way, smiles will be delivered!