540 bytes NFC tag Diameter 25 mm NTAG215 Anti metal NFC StickerBasic Feature:With anti metal layer NFC sticker , Anti metal NFC Sticker Works well on Metal surface , 540 Bytes memory , 504 byte User memory , 492 Max URL ;Anti metal layer is cost , normal size will reduce the cost ;Round 25 mm Anti metal NFC sticker is good for you ;Specification:IC :NTAG215 ;Frequency : 13.56MHz Material : paper ..