This pack of 10 UHPPOTE EM4100 EM4102 125KHz RFID EM-ID Card Tag Token Key Chain Keyfob is perfect for access control systems. The cards are read only and made of PVC material. They are compatible with stand EM ID access devices or ID reader and cannot support HID, Cobra, APCiK etc. The cards are black in color and are perfect for regular 125KHz RFID Card type EM-ID 4100/4102. Get these cards and make sure your access control system is secure.