Sounds really shit. The RFID card will have a chip too. The 'tendrils' are the aerial which is a thick loop (of many wires) round the outside. So punching a ho

Sounds really shit. The RFID card will have a chip too. The 'tendrils' are the aerial which is a thick loop (of many wires) round the outside. So punching a hole in one corner is a non-starter, but there's a good chance you could punch one in the middle if you work out where the chip is Of course, the simpler option is just to get a lanyard with card holder.