Nikko is a Japanese brand of pens used for drawing comics / manga. Comic nibs are famous for producing strong and crisp lines that are difficult to duplicate with pens and brushes. They are great for creating detail in drawings. Varying nib types are available to suit your drawing needs. Each nib should be used with a nib holder which is sold separately.
Maru / Mapping: Suitable for fine artwork as you can achieve a very fine line easily.
Sphere Point: Possible to vary drawing line strength (bold and fine point)
G-Pen: A multi-use nib capable of drawing thin or thick lines depending on the amount of pressure applied.
No.5 School: Pen point is slightly softer, and the lines produced a little bolder