RECALIBRATE IF SEAL BROKEN, Tamper Resistant Vinyl Label, 200 Labels/Pack, 0.75" x 0.75" Unlike other labels, your print is not thoroughly protected. These labels are not designed to withstand heavy abrasion. A key feature of TheftGuard labels is that they are "frangible" - materials designed to break apart to show evidence of tampering after it is fully adhered to an object. Labels are screen printed for extra durability.