13.56MHz HF RFID Metal Cards are made of stainless steel and rfid chip .It is also contactless rfid card under 13.56MHz .Normally rfid or nfc sticker can not work on metal environment and we engave a slot then put anti-metal nfc or rfid sticker inside then can be rfid metal card . Comparing the plastic rfid card our metal rfid cards are luxury and more durable in working .