Just unscrew the barrel of the watercolor paint pen to add water or ink, press the barrel to easily control the ink or water flow.Made of nylon hair brush head and plastic body, these watercolor pens are non-toxic and stay intact, won't spray, smear or smear, just enjoy easy and fun painting with your kids.Different types of watercolor brushes can help you with fine art, you can draw thin lines or paint large lines, mix colors and create new shades, one can be filled with water for solid or powder like pigments for use with watercolor crayons, markers and watercolor pencils.These watercolor pencils are suitable for all water coloring needs, well crafted, well sealed, durable and easy to clean, you just need to clean with water.Colour: as shownMaterial: plasticPackage Contents:12 * Pen caseOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.