The Fudenosuke Twin brush pen has two elastic brush tip and is especially suited for calligraphy, sketchnotes, hand lettering, doodling, bullet journaling and much more. The line width varies from thin to wide depending on the pressure exerted on the tip. Soft tips (degree of hardness 2) are especially suited for larger writings. The ink is waterbased and odourless. Ink colours: Black and grey.