The Aquastroke Brush Pen is an innovative way to paint with water-soluble mediums either on-the-go or in a studio! Aquastroke allows artists to add water without carrying a separate water supply great to travel with. 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 and are incredibly accurate allowing you to create strokes with ease. These brush pens can also double as a brush marker; simply add ink to the water basin and begin painting. Great for use with watercolor pencils and crayons, half pans and watercolors tubes.