Heat-resistant 8" x 11" sheets stay flat and will not jam in laser printers. Includes instructions for printing with Microsoft® Word. Tough-Tags are chemical-resistant, flexible, polyester labels that can withstand autoclaving, boiling water baths, freezing to -40°C, or heating up to +121°C without peeling, cracking, or falling off. They adhere strongly to plastics and other materials. Twenty-five sheets of labels per box.