The 5x5mm FPC tag is based on polyimide or polyester film, which has high reliability and excellent flexible printed circuit board. It has the characteristics of high wiring density, light weight, thin thickness, and good bendability.Due to the limit space to put the NFC tag inside, the traditional aluminum antenna couldn't have the mini size.But the 5*5mm RFID mini rewritable small nfc tag with copper antenna works perfectly in this situation.With so small size this kind of tags usually used in various electronic devices such as Bluetooth speakers, NFC rings, NFC wristbands, etc.