Mangaka pens are ideal for all-purpose use such as drawing, sketching, lettering, journaling and more! The ink will not bleed when used with alcohol-based markers and watercolor after the pen line has completely dried. The black Mangaka offers seven options of nib sizes and also offers two flexible nibs. The color Mangaka come in a variety of nib sizes and are available in 2 colors. The smallest pen size is 0.03mm.