1.Strong Plastic NFC Keyfobs 2.With free metal Key ring 3.NXP NTAG203 chips 4.Different colors available A Great Looking strong plastic Round Strong Waterproof NFC NXP NTAG203 RFID Tag working with all nfc mobile phones 1.Waterproof, durable, and fashion shape2.Flexible usage, like for room key,ID cards, access control3.Keyfob measures 4cm by 3cm. Ring is 2cm diameter, and other sizes shapes are ...