Deep-freeze thermal-transfer labels for identification of vials, tubes, freezer boxes, plastic bags (at -196°C in liquid phase and vapor phase Liquid Nitrogen, and -80°C freezers) and other containers. Designed for long-term biopreservation in laboratory deep-freeze and harsh environments. Ideal for dry ice transportation. Labels can be printed with all major brands of thermal-transfer printers. For most durable printing is recommended to use alcohol-proof resin ribbons.