The Signo Bit makes the thinnest line of any pen at 0.18mm. The tip is so small you can write words on a grain of rice. It comes in 8 colors (orange, light blue, violet, pink, red, black, emerald, and blue).The pen works great for writing in between lines or in tiny margins. The Uniball Signo also comes in a 0.28 mm and 0.38 mm thickness.
The Pilot Hi-Tec-C pens are available in .25mm, 0.3mm, 0.4mm and 0.5mm sizes and in a variety of colors. The only difference between the Hi-Tec-C and the G-Tec-C4 is the ink — the Hi-Tec-C has a superior gel ink that is highly insoluble with most pigments (whereas the G-Tec-C4 has a highly soluble ink).
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