RFID keyfob tag is made of ABS case and RFID chip , it can work with125khz low frequency , 13.56mhz high frequency normally use for door control access , membership management and identification application .You can set up your logo or texts and print on case surface or laser engrave UID on case . Many different color and size cases can be optional . Printable and durable case make more and more popular on RFID market .