It looks like some sort of wiring inside
Brush from an electric motor. Looks to be a new-ish one.
Could be from a destroyed power tool, or discarded from an alternator or starter rebuild.
https://www.amazon.com/General-Electric-59G-Brush-Motor-AK-Motor-Brush/dp/B01F818V7Y
Looks like the piezo-electric igniter from a lighter. Either that, or what GreyShuck said - A carbon brush from a motor.
It’s definitely a motor brush.
I’ve never seen a piezoelectric igniter that looks anything like what OP posted. Just to be clear, you’re talking about these that are in most lighters, right?
Image of piezoelectric igniter

It’s definitely a motor brush.
Yep. Here’s an example.
Yes. There’s one variant that looks more similar to Ops picture, but I haven’t seen it around in ages. But the wire inside the spring is more indicative if a motor brush.




