500 X COA Certificate of Authenticity Tamper Evident Security Stickers / Labels with Hologram and Corresponding Small Label 500 X Tamper-proof certificate of authenticity labels, will spoil the label when removed with VOID throughout AND leave the word VOID upon the item affixed. Large label with unique, matching, serial number and barcode. The barcode is a WORKING code 39 regular barcode which contains the serial number shown on each label. Corresponding small label with matching serial number; useful for YOUR paperwork or for attaching to extra paperwork accompanying your item GUARANTEES the unique identification for each of your products and assures your clients that the item has been ratified and verified by YOU. Attractive white and silver label with gold holgram strip. Stops attempted duplications AND looks aesthetically very attractive indeed.