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MiFare Classic (13.56 MHz) Tag Assortment
One of each of our favorite Mifare Classic 1K tags, 5 in total!
These can be read by almost any 13.56MHz RFID/NFC reader but make sure it can handle MiFare cards as there are a few other encoding standards (like FeLica)
They are tested and work great with theAdafruit NFC/RFID Shield for Arduino!
These chips can be written to store up to 1 KB of data in writable EEPROM divided into banks, and can handle over 100,000 re-writes.
There is also a permanent 4-byte ID burned into the chip that you can use to identify one tag from another - the ID number cannot be changed.