The sketch marker is inspired by Japanese calligraphy pens. It promises to provide vivid paintbrush strokes. It is waterproof and will stay put all day. I found the eyeliner dried out very quickly and the color was not bright or bold at all. I had to apply two coats to get visible color on my lids. The brush point also dragged against my skin. Definitely not the easiest or best eyeliner I have used.