ZIG Kuretake Ultra fine tip brush pen : Ai liner ltra fine tip brush pen. This brush is so fine it is possible to draw on a rice grain (like the famous Japanese artist Hokusai!) The name “Ai liner” (Japanese ‘ai’ = love) is inspired by “Eye liner” because this ultra fine tip is as fine as make-up eye liner! (But this pen is definitely NOT for using as an eyeliner!) Ink colour : Black Ink type : Pigment ink (Water proof when dry)