Austor Water Brush Pen 6 Pcs Watercolor Water Brushes Set Easy to squeeze barrel,control the ink or water flow with just a squeeze of the barrelNote: Please make the water less than 2/3 of the pen's volume when filling water into the pen Easy to clean,just using water to clean after used Durable nylon brush tip,would not stray or spread while painting Great for solid colors or powdered pigment, use with aquash watercolor crayons, markers, and pencils to spread and smooth colors 6 tip sizes, Set of 3 Point tip brush pens and Set of 3 Flat tip brush pens(small, medium, large)