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1.MIFARE ONE 1K Chip 2.Credit card size(85.5*54*0.84mm). 3.PVC Material. 4.blank white card. 5.13.56MHZ. 6.ISO14443A 7.Surface material:PVC 8.Data retention:>10 year 9.can work with RC522 and PN532 10.UID Can't change,because it's Standard MIFARE One chip inside. 11.we don't print the id number on the cards,because it has many different kind of Reader in the market,output format is different,so we don't print the id number on the cards,so buyer need to use the reader to read the card number.we also sell the reader on our store.