Durable Permanent Id Labels With Trueblock Technology, Laser Printers, 0.66 X 1.75, White, 60/sheet, 50 Sheets/pack Identify property, communicate safety and warning messages and display bar codes. TrueBlock® Technology - guaranteed to completely cover everything underneath so you can re-identify items! Moisture-, scuff-, tear-, smudge-resistant polyester with extra-aggressive adhesive to stay permanently attached. Ideal in extreme temperatures, high-traffic areas. Easy to customize with free templates from Avery® Design & Print. 8 1/2" x 11" sheets for laser printers.