MF1S70 4K ISO14443A 13.56MHz RFID Keyfob Tags are made of ABS material with rfid chip and antenna . they will be durable and injection ABS case then sealing rfid chip under ultrasonic machine without any space sideview so that you can use them in out-door harsh environment and waterproof. This kind of rfid keyfob tag has embedded with MIFARE®Classic EV14K ( MF1S70 ) which is manufacturer programmed 7 byte UID or 4 byte NUID and individual set of two keys per sector to support multi-application with key hierarchy .Also it is working according to ISO / IEC 14443 Type A. Customer logo printing ,engraving number and barcode are available .