SIZE : 9.29 x 4.17 x 0.83 inches.The mailbox replacement flag set works best on smooth surfaces.YOU'VE GOT MAIL : US Postal regulations require that all mailboxes have a mail box flag to qualify for outgoing mail pick-up. Replace a missing or broken mailbox alert flag with our red peel and stick flag kitEASY TO INSTALL : The mailbox red flag replacement kit can be installed in seconds without any tools. No need to fuss with bolts and screws or other hardware,just peel and stick the flag to your mailbox and it's ready for useMADE TO LAST : Our mailbox flags replacement kits feature very high bond tape. Rain, snow, or shine, your flag will remain secure on your mailbox