Security and sealing label for printing in thermal transfer printer. After application, the label cannot be removed without the label being layered. The text "VOID" or a checkerboard appears and indicates the removal / opening attempt. Excellent for sealing packaging, valuables and sealing of goods prone to theft. Silver matte MT303 polyester for printing in label printers. Checkerboard labels are UL approved, VOID labels are not. Core 38 mm. 3-row. Roll of 6000 pcs.