HF 13.56MHz On-Metal MF 1K RFID Sticker is made of paper, softer pvc or pet material with customized printing on top with optional anti-metal adhesive backside . round 25mm ,30mm or customized size ,shape are available .13.56MHz and ISO 14443A protocol , 0-16 sectors with 1K byte memory . Setting up anti-metal layer or ferrite material can make our nfc sticker can normal work on metal or battery surface and does not be effected by electromagnetic field . Widely use for metal objects management , nfc enable phone ,social network , cashless payment .etc .