A thin felt pen made for slightly textured yet non-rough lineart. I made this pen for detailed and thin lineart, recommended brush size range is from 5.0 to 35.0. Changing the 'Particle Density' and 'Particle Deviation' settings, altering how thick or textured the pen is. I'd recommend checking out these two settings and trying different combinations between the two. This pen is pressure-sensitive, allowing for light strokes.
The below demonstration image was drawn entirely with the Thin Felt Pen, it was drawn using only the pen's default settings (including the 13.0 default brush size).