The Talens Ecoline Brush Pen is very user friendly. Handy when travelling and ideal when working at a place that needs be kept clean. The Brush Pen is ready for immediate use, and is odorless as well. You can use the Brush Pen for thin, precise lines or for energetic strokes, but also for filling in large color sections. The Brush Pen is suitable for both a quick sketch and adding the finishing touches.