I love this brush with any gel liner, I have a great control on the application, I manage a thin(ish) line. It is a soft and comfortable brush.
BP043 Eye Liner Brush / Koyudo BP High Class Series Customer Reviews
Makeup Brush
I was looking for a brush to smudge pencil liners when I bought this brush. It turns out to be smaller than expected, and it has too much give to smudge pencil liners. So I bought a different brush for that purpose, the C008. As for this BP043, I use it for shadow liner instead, and here it excels. On occasions, I have also used it for my brows and it's great there also.
Before I found this brush, it was always a struggle to apply shadow eyeliner, as most brushes were either too wide or too thick, and when they were the proper shape for my eyes, they were uncomfortably rough. This little brush is perfection! It is firm but soft, never pokey. The size and shape are ideal for detail work. I can't foresee myself needing any other shadow eyeliner, and will be purchasing backups of this gem.

