GoToTags Heavy Duty On-Metal NFC Tag - Sticky Token - NTAG213 - Black - 30 mm with 5 mm Hole - 10 Pack Includes 10 black Heavy Duty NFC tokens 30 mm (1.18 in.) circle on-metal sticker tokens with 5 mm hole in the center and 3M adhesive backing Waterproof ABS housing seals the NFC chip inside which allows for almost any outdoor application 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