A. Rifkin's ARCO ID™ security labels offer a means to deter and quickly detect unauthorized access to almost any item. Best of all, these 1" x 3" self-adhesive labels leave zero surface residue once they are removed. Once attached, the label cannot be removed or manipulated without displaying a "void/open" alert message. If the label is even partially lifted, the covert message clearly appears on the label without ever transferring residue to the surface of the item. Rifkin ARCO ID labels are also printed with a unique serial number and bar code for tracking within complex or automated systems.