Artecho 72 Dual Tip Brush Pens, Colouring pens for Adult, felt tip pens, Colouring Books, Calligraphy, Drawing, Sketching, nylon tip for Artists, Beginnersfelt pens thick and thin, the 0. 4 mm fineliner is suitable for drawing relatively thin lines, you can use it to write protocols and some designed line designs; 1 2 mm felt pens are well suited for coloring books, signing, design, art projects and hand lettering. Wide application, Artecho Dual Brush Pen Set is ideal for Bullet Journal, Manga, Coloring Books, Handletting, Map Design, Motive Stinging, Sketching, Illustration, Hand Lettering, Planner,