This is Kuretake Cocoiro's calligraphy pen in dark blue.
Kuretake Cocoiro calligraphy pen consists of two parts that you can combine according to your taste - the body and the contents.
Cocoiro has a medium-flexible tip that allows you to write just as much or even a letter of pressure when applying different pressure, and it is also suitable for sketching and drawing. In addition to the body, choose the contents of the calligraphy, brush or gel pen. The contents of the brush and gel pen are only available in black ink, the contents of the calligraphy are available in different colors.