72 Colors Markers for Adult Coloring Books, Dual Tip Markers for , Fine and Brush Tip for Adults Coloring Books, Calligraphy, Drawing, Sketching Felt tip pens thickness and thin, the 0.4 mm fineliner is suitable for drawing relatively thin lines, you can use it for writing protocols and some designed line designs; 1-2 mm felt tip pens are good for colouring books, signing work, design, art projects and hand lettering Wide application: dual brush pen set is ideal for bullet journal, manga, colouring books, hand lettering, card making, motif stamping, sketching, illustration, hand lettering, planners, calendars, calligraphy and much more High safety, dual brush pen set is all made of acid-, odourless and non-water-based ink High quality, light fastness, vibrant colours, easy to clean Ideal gifts, dual brush pen set is an ideal art gift for family, friends for birthdays, Halloween, Thanksgiving, Christmas, etc.