Zebra Direct Tag 850 101.6 mm. Diameter: 1.91 cm, Core diameter: 1.9 cmAn uncoated direct thermal 80 micron paper tag stock that produces high-contrast black images when used with Zebra desktop and mobile printers. This material has a 5-year lifespan for indoor document archiving under recommended conditions. Most commonly used for point-of-sale receipts, as well as parking enforcement and route accounting. Compatible Printers: QL 420. - Outer Diameter - 0.75\" (19.05 mm). - Inner Core Diameter - 0.75\" (19.05 mm).