【Set includes】This Set of water pens contain 1 sponge, 3 point tip brush pens(small, medium, large) and set of 1 flat tip brush pens , suitable for art students, amateur and professional artists. 【Easy to Use and Control】Water coloring brush pens simply unscrew the watercolor pens' barrel to add water or ink. Simply to squeeze the barrel to easily control the ink or water flow. (Note: Please make the water less than 2/3 of the pen's volume when filling water into the pen). 【Multi-purpose】You can draw the finest line or color large lines, blend colors and create new shades.Great for solid colors or powdered pigment, use with watercolor crayons, water-soluble pencils, water-soluble pigments, inks. 【High-quality nylon brush】water pens high-quality and soft nylon bristles， Each waterbrush brush pen is made of nylon fibers to hold their point and are easy to clean with water. High quality nylon hair brush tips that stay intact and does not spray, spread, or smear while in use. 【Easy to change color】Sponge with water is absorbed strongly.When changing color , you can use the sponge to clean the nib to avoid color mixing. 【Support】 30-day money-back guarantee for any reason, If you have any problems or issues about the product, Please contact us.