Thinwriters Fude have a type-brush pen and their application is usually associated with Japanese calligraphy, but can also serve as a great art tool for all artists.
Their pen is made of foam or fibers for a standard paintbrush, usually shaped as a perfectly normal writing tool, making it more convenient to use in motion than most markers.
Highly pigmented ink for painting.
High warp resistance.
Waterproof, permanent.
No odour, no acids, neutral pH.
Color: black.
Pack size: 6 pieces. 
On request