Read only 125 kHz PVC proximity cards, preprogrammed with a unique 10digit ID printed on each card. These cards cannot be rewritten or reprogrammed, making them reliable for access control and ID management where fixed identifiers are required. Key benefits Ready to use: Each card comes preprogrammed with a unique 10digit ID printed on the card, eliminating setup of individual identifiers. Secure fixed ID: Read only design prevents accidental or unauthorized rewriting of card data. Broad compatibility: Works with universal 125 kHz RFID systems and tags such as EM4100, EM4102, and TK4100. Printer friendly: Designed for use with most directtocard ID printers for quality custom printing. Features and specifications Frequency: 125 kHz proximity, unencrypted read only format. ID: Unique 10digit number printed on each card. Quantity: Pack of 100 cards. Size: 3 3/8 inch by 2 1/8 inch, 30 mil thick (credit card size). Material: Durable PVC plastic. Printing compatibility: Compatible with many directtocard ID printers such as Fargo, Magicard, Zebra, Evolis, Badgy, DataCard, and Nisca. Not compatible with inkjet printers. Compatibility and limitations Suitable for 125 kHz RFID proximity access control systems and ID management systems that accept unencrypted 125 kHz tags. Not compatible with other frequencies such as 13.56 MHz. Not compatible with encrypted or proprietary tag formats including HID, Indala, Cobra, APCiK, Paradox, Kaba, Isonas, and similar systems. If you plan to register cards to a lock or access control system, confirm that the system uses unencrypted 125 kHz tags. Practical use scenarios Office access control: Register cards as employee access keys for doors and turnstiles that accept 125 kHz unencrypted tags. School and campus IDs: Issue student ID cards or hall passes with printed names and photos while using the preprogrammed ID for attendance and access tracking. Event or visitor badges: Produce printed visitor badges or promotional business cards with embedded fixed identifiers to track entry or attendance. What makes these cards stand out Preprogrammed and printed ID simplifies inventory and deployment. Standard credit card dimensions and PVC construction make them compatible with typical cardholders, badge reels, and printers. Read only format reduces the risk of accidental data changes in systems that require stable identifiers. Notes Verify your access control or reader hardware accepts unencrypted 125 kHz tags before . These cards cannot be reprogrammed or rewritten.