So I had to have an MRI today and when your in the machine you wear these headphones so that they can talk to you and stuff, but how could they work with no metal? I realise that there are non-metal conductors but I thought that they had to be doped with metals (to make them semiconductors) so that they conduct well. I would keep voicing my ideas (I had a lot of time to think haha) but I really dont know what I'm talking about. Does anyone know how they are made, or how they think they are made? Just curious to know.