Chinesium strikes again

Was watching a video on youtube about defective jumper leads. They have high resistance. They are supposedly copper wire leads. When you peel back the insulation, copper is visible. However, it's not copper wire. It's iron coated with copper. Sleazy.

So, I checked the jumper leads here at my work. Found one defective lead.
If you can't tell what's happening in the picture. It's a stick magnet attracted to the jumper lead.