The Aquastroke Brush Pen is an innovative way to paint with water-soluble mediums on-the-go or in a studio! Aquastroke allows you to add water without carrying a separate water supply. Just fill the barrel with water and you're ready to go! Because Aquastroke pens have their own water basin, artists need not worry about spills or messes-- making these pens are perfect for plein air! Aquastroke Brush Pens are made with high quality, white nylon brush tips. They are incredibly accurate and create strokes with ease. These brush pens can also double as a brush marker! Simply add ink to the water basic and begin painting. Great for use with watercolor pencils and crayons, half pans and watercolors tubes.