This is a pack of Smart Materials for use in Substance Painter 2018.2 or later.
This pack includes 18 stylized metal materials;
Steel
Iron
Dark Iron
Gunmetal
Bronze
Brass
Copper
Silver
Gold
Old Steel
Old Iron
Old Bronze
Old Brass
Old Copper
Rust
Dirt
Verdigris
Painted Metal
Release 1.41
I've removed the "Old" version, since it was being automatically downloaded and causing some confusion, and was an objectively lower quality version anyway.