GDF Studio Garden Flag Double-Sided, Polyester, Yard Flag to Brighten Up Your Home 12.5" x 18" Part of Magnet Works collection of matching flags, mailbox covers, and yard signs Fits standard size mailboxes 6"x19" Meets US Postal Requirements Attaches to metal mailboxes with magnetic strips. Adapter kit for non metal mailboxes sold separately. High quality flexible vinyl. Made in the USA. Reusable, change covers for each season