The brush tip of Kuretake's Gokuboso N° 24 fude pen is similar to a classic calligraphy brush. You can use it to alternate between thin and thick strokes, lines and strokes. The black ink is fast-drying.
The product specifications of the Gokuboso N° 24 fude pen from Kuretake:
* ink color: black
* ink type: pigmented, water-based
* tip: brush tip (polyester)
* refillable with a separately available cartridge
Japan's Kuretake was founded in 1902 by Narakichi Watatani, an e-sumi craftsman. Since 1973, it has been making fude pens. These are a kind of brush pens, originally developed specifically for Japanese calligraphy. But you can use them for much more. They are also perfect for sketching & drawing, manga, handlettering, brush lettering, bullet-journaling & urban sketching.