Disc tags are transponders laminated between very thin foils. The foils can be made from different materials like PET, PETG, PVC or PC and protect the transponders from dust, dirt and humidity. For instance, PET material is appropriate for most pharmaceutical, medical and food applications. Disc tags are suitable for further assembling and labelling as they are easy to handle. Disc transponders are also available with adhesive foil on one side or with a central hole for easier tack.