Blank White PVC Cards with a TK4100, 125kHz proximity chip

(these are sometimes called RFID, but that is not strictly the correct term).

These cards are read only, meant for use with access control systems, door entry access, and time clock cards.

Please note that these cards do not have their ID numbers printed on them, you can read their ID number using a 125kHz card reader (these readers normally simply plug in to your computer and type the number when you scan the card).