Waterproof Address Labels With Trueblock And Sure Feed, Laser Printers, 1 X 2.63, White, 30/sheet, 50 Sheets/pack Durable, waterproof, UV-resistant polyester labels provide strong protection from harsh environments and conditions -- resisting moisture, scuffing, tearing and smudging. Ultrahold® Adhesive sticks to more tough surfaces ensuring your label doesn't fall off your package. Labels with TrueBlock® Technology are guaranteed to completely cover everything underneath so you can re-use mailing tubes, boxes and more! Extra-strong adhesive adheres to metal, plastic, glass and more. Easy to customize with free templates and designs from Avery® Design & Print. 8.5" x 11" sheets for laser printers.