MONO TWIN permanent marker of the brand TOMBOW. 
Permanent marker with thin (0.4 mm) and thick (0.8 mm) tip. The ink is oil-based and waterproof. No waiting time for coloring - color can be painted over immediately without smudging or running. 
Super suitable for outlines Ideal in combination with the bright colors of the Tombow ABT Dual Brush Pens or the water colors from mmwatercolors. 
The MONO twin fineliner is suitable for outlines, calligraphy, characters, sketch notes, zentangles and much more