Pilot G-Tec C4 Microtip Extra Fine 0.4mm Gel Ink Rollerball Pen - All Colours. Why buy the Pilot G-TEC C4 Microtip Rollerball Pen?. Pilot's G-TEC C4 allows you to draw an incredibly thin 0.2mm line, making it perfect for those who need to write a large amount in a small area of the page.
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