Here you'll find a nice selection of mailbox covers for party of any type, including balloons, beer, girls night, wine & more. Available in mailbox covers across all seasons, mostly Summer. 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 standard size fits 6.5" x 19" mailboxes. No worry if you have a plastic or aluminium box, see the Adapter Kit.