Clear Thin NFC Tag - Token - NXP NTAG213 - 18 mm - 10 Pack Includes 10 clear NFC tokens 18 mm (0.71 in.) circle token Waterproof plastic seals and protects the NFC chip 144 usable bytes of data; suitable for a url, text, small contact record or single action phone trigger Compatible with all GoToTags software and NFC-enabled phones