This Zebra G nib is made of chrome-plated steel. Similar to the popular Nikko G Nib, but a little more flexible and sharper. It will produce a finer hairline than the Nikko. Same sturdy quality. If you are using the Nikko G but would like to be able to write with thinner hairlines and thicker strokes, give these new nibs a try. Michael Sull still recommends the Nikko G nib as best for learning Spencerian, but this Zebra G Nib is a good one, too for Spencerian.