RFID card revealed

Customer had two faulty RFID cards and so, she let me take photos of them. The cards were already peeled (so, its not my doing, OK?). So, for all you modellers who need fine wires for your model details, you know where to look but make sure you can still get in to the office in the morning.

This card would go for a few ringgit and there is
nothing there save for a large antenna made of
thin copper wires wound in a loop.

I peeled the card a bit more and there you go, the
actual chip (black thing) at the side of the card's
edge. I think its no bigger than 4 mm.