The fine-point conical tip on ChartPak Fine Point Markers makes them ideal for lettering and detailed drawing. Just like the Original ChartPark AD Markers, it is easy to make multiple line widths with these markers using just a flick of the wrist, using the fine point for thin lines, and the cone side for thick lines and shading. The strong nylon tips are resistant to crushing. The vibrant xylene-based inks are no-toxic and acid-free when dry. A classic marker that has been a long-time favorite of designers.