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The [[Haro]] production had a moderate success due to the glass nib, especially for the characteristic to enable writing on multiple layers of carbon paper, widely publicized by the company. The nib was also corrosion resistant for inks and had very little costs, making the pen cheap. The main drawback still remained, beyond the mechanical fragility, that of a much more rapid consumption of the tip, in addition of course to the writing rigidity.

The ''Haro'' production had a moderate success due to the glass nib, especially for the characteristic to enable writing on multiple layers of carbon paper, widely publicized by the company. The nib was also corrosion resistant for inks and had very little costs, making the pen cheap. The main drawback still remained, beyond the mechanical fragility, that of a much more rapid consumption of the tip, in addition of course to the writing rigidity.