10 piece Sets These pens are a wonderful tool for coloring, fine art, illustrations, doodling, journaling or hand lettering. They feature a dual-tip design: one brush tip for painterly lines and one fine tip for details. The brush tip is flexible and smooth, transitioning seamlessly from thin, medium to thick lines with the slightest pressure. The single ink reservoir ensures that colors match up. Blend colors on a palette and apply with the marker tips for and endless palette of color; tips self-clean after blending.