Blackening Stainless Steel + Copper(Red) 

9iNE-C (Copper) with copper back plate.
Copper coloring is COPPER-RED by Momentum Factory Orii. The antique finish using rust is very austere.

The sound is the mildest and thickest among 9iNE.
The midrange has a particularly resonant impression. Highs are mild and soft. The low frequency range seems to have a lot of volume with a relatively thin sense of density.
I think it is good for male vocals, etc.