Uchida Le Pen has a smooth writing micro-fine plastic point and a sleek barrel design. They're great for business forms, notebooks, diaries, memo pads, letters, journals, yearbooks and scrapbooks. The inks are smudge proof and come in a variety of different colors. Ink colors match barrel colors. The ink is acid free and non-toxic. .3mm. Drawing Marker Card Brush Black- Pen is perfect for detailing, cartooning, or any other technical drawing.