The dual brush pen from Tombow is made for calligraphy and artwork and is available in a selection of 96 colours. It has two tips (a flexible brush tip and a fine-point, hard nylon tip). Both of these tips draw ink from the same ink reservoir ensuring perfect colour match.
The flexible brush tip works like a paintbrush to create fine, medium or bold strokes by changing the pressure on the point. The fine tip is for consistent lines, borders and fine lettering. The water-based, odourless, acid-free inks can be blended to create a desired colour and by dipping them in water you can create subtle colour washes.
Sold separately is a colourless blender for shading.