I know it's not copper, i think they're brass.

Anyone use clothes hangers?

I don't think you would find it suitable. clothes hangers are made of steel.
The most common wire for beginners is anodized aluminum, made specifically for
bonsai. For very thin twigs, I use florist's wire.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)