Mapping nibs are world renowned by calligraphers for extra fine writing and by artists for drawing, sketching, mapping and cartooning. The nibs are extra fine for delicate, accurate lines. Because the base of the nib is a small tube it will not fit in a standard dip pen handle, it needs a mapping pen holder. Nib points have a protective lacquer to prevent tarnishing. Briefly immerse the full pen point in boiling water before first use to remove. Washing your pen in lukewarm water after each use, then drying it gently with paper tissue, will maintain its optimum performance. Length: 3 cm. Width : 3 mm