The Outgoing Mail For Pickup magnet is the perfect way to alert your postal delivery person that you have mail to be picked up. No installation required, just stick it to your metal mailbox and you’re done. Keep indoors when not in use. The large size and bold colors make it easy for your mailman to spot. It can be used on wall mounted porch mailboxes, but can also be used as a replacement for a broken mailbox flag. Cannot be used on plastic mailboxes. Size: 4x6 inches.