3M Adhesive DESFIre® EV1 4K NFC Sticker is 13.56MHz nfc chip and antenna with paper or softer pvc , pet material .It is a common criteria(EAL4+) certified product .Widely uses for advanced public transport schema ,highly secure access management , closed-loop e-payment , event ticketing ,eGovernment applicaitons all are based on the high level of security using a 3DES or AES hardware cryptographic engine for enciphering transmission data . Customized printing and size are available , also they have optional memory in 2K ,4K and 8k .