Tombow - Fudenosuke Soft Black
The Fudenosuke brush pen has an elastic brush tip that is perfect for e.g. for calligraphy and sketching.
The thickness of the line varies from thin to wide depending on the pressure applied to the tip. WS-BS (hardness class 2) is well suited for larger calligraphy works and sketching.
The ink is water-based and odorless.