I don’t know if it’s useful but it’s a brush that draws a metal ribbon.
Brushsize and Highlights are controlled with pressure.
It combines main and secondary color.
You can also use it to approximately fill out shades and highlights of a metal object and then blur it. Afterwards you can add decotations with the brush…
The brushtip can be used as a metal texture. (The highlight you see in the preview picture is not part of the brushtip.)

There is also a gold ribbon brush:
https://assets.clip-studio.com/en-us/detail?id=2175340
and a gold line brush:
https://assets.clip-studio.com/en-us/detail?id=2175574
