From the Stars and Stripes American flag to fireworks and everything in between, you'll find the perfect patriotic and 4th of July mailbox cover here from Flagsrus. Choose from Celebrate, Fireworks, American Flags, God Bless America, Pinwheels, Americana & more! Flagsrus offers high quality, large magnetic mailbox covers from Magnet Works (Studio M). Add a splash of color with a vinyl weather resistant mailbox cover! All covers feature a slot for the postal carrier alert flag. These covers attach to the mailbox with magnets. The large size fits 8" x 21" mailboxes. No worry if you have a plastic or aluminium box, see the Adapter Kit.