Pilot's famous brush pen "Shunpitsu" is equipped with "quick-drying ink" that dries in 1 second proven in many researches.
This allows the handwriting to dry quickly, so your hands and writing will not get dirty.
It is also recommended for those who are not good at brush pens because the ink dries slowly when writing and the writing gets dirty.
"Small brush" model is recommended for those who have no experience with a brush pen as it feels like a felt-tip pen. There is a <Hard Tip> that allows you to express splash and tension.