50pcs 125KHZ TK4100 diameter 25mm!
If need another size, remark message in your order.
1. High quality pvc material 2. Frequency: 125 KHz 3. Size: 20mm x 1mm 4. Reading distance is 0 - 10cm 5. Package included: 50pcs RFID read-only coin cards with TK4100(compatibleEM4100) chip sealed in. 6.If you have some other problem,please contact with us.Thanks!