why rfid tag not working

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RFID Card Thin Proximity LF Cards 125Khz Set of 1000
Product Features:
- Brand OEM
- Type Two Sided RFID Card
- Size 86X54 MM CR80
- Material Plastic, PVC
- Shape Rectangular
- Color White/multicolor Printing
- Use Office/College, Event, Exhibition
- Printable Yes

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