The new Brush Pen is friendly to use, practical for on the go and ideal if you work in a place that needs to remain clean. The Brush pen is ready to use and also odorless. You use the Brush Pen for thin, precise lines or energetic stitches, but also for filling large areas of color. The Ecoline Brush Pens adhere excellently to watercolor paper, drawing paper and cardboard. They are also ideal for on the go or if you work in an area that needs to remain clean.