1000 X Security Labels "Do Not Break Seal" Black With White Printing Tamper Evident Each With Unique Serial Number 1000 X BLACK "Do Not Break Seal" security labels [white printing on black substrate]. Tamper-evident labels/stickers. Each with UNIQUE serial number and barcode. Can be used for sealing / securing boxes / parcels / items in cases where visual evidence of tampering is required. Label self-destructs and leaves the message "VOID" and "OPEN" in bold, BLACK print when someone attempts to remove it. 50mm wide by 20mm high. Wording is: "Security. Do Not Break Seal".