NFC Key Chain,13.56khz Plastic Key Tags Size:37*30. ... *8.2mm Blue/Grey,other color need customization. 13.56mhz:Mifare 1K S50 Printing Card Number is optional (8digits,10digits,18digits ... at 13.56MHz nominalNXP Mifare1 S50, Mifare1 S70, Desfire MF3ICD41, Mifare Ultralight, Icode1, Icode Sli , Legic mim256, JWL872, TI256, TI2048,INSIDE ...