MailWraps Christmas Cardinals Mail Box Cover 01013 Part of the Studio M collection of matching flags, mailbox covers, and yard signs. Attaches to metal mailboxes with magnetic strips. Adapter kit for non metal mailboxes sold separately Fits standard size mailboxes 6.5 inches by 19 inches. Meets US Postal Requirements High quality flexible vinyl. Made in the USA. Reusable. Change covers for each season.