Mail Alert For ALL Brands of Curbside Mailbox This is the one to buy when you are unsure which one will fit on your mailbox. Bright yellow metal paddle is visible for over 300 feet. UV Resistant. Can't Rust! Made out of a durable powder-coated aluminum. If our alert fails within 10 years of purchase, for any reason simply return it for replacement! EASY to attach to any mailbox. Adjustable Polyester Cord for a Universal Fit. No holes to drill!