【QUANTITY】Each package has NFC tags【CHIPS】 Tag215 chips， 504 bytes of memory, password protected authentication, high scan strength, easy to program. The 215 chips has a read-write lock function, which can be edited repeatedly or read-only. Tags cannot be edited or reset once they are set as read-only. Service life: 10 years, 100,000 erasing and rewriting (A-miibo can only be written once, not repeatedly erasing and rewriting)【MATERIAL】Unique ABS high-temperature resistant material，High temperature resistance up to 190 degrees Fahrenheits，Non-toxic/Tasteless/It is abrasion-resistant/It has good stabilityVery safe to use【CONVENIENT TO CARRY】Each NFC Tag comes with a keychain iron ring that can be hung on items such as keys and backpacks, making it very convenient to carry and not easy to lose【FEATURES】Compatible all NFC-enabled devices , you can use them to quickly share your social information, music, connect to WiFi, Build smart homes and more to make your life more colorful