Shipping Labels W/ Trueblock Technology, Laser Printers, 2 X 4, White, 10/sheet, 100 Sheets/box Create professional-looking labels quickly. 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! Easy to customize with free templates and designs.