Easy to use: just unscrew it (in a different way than usual) and fill it two-seconds with tap water, and you're ready to go. Simply squeeze the bucket to easily control the ink or water . It is very suitable for pure color or powdered pigments, used together with watercolor crayons, water-soluble pencils, water-soluble pigments, and inks. High-quality watercolor pen: The high-quality nylon hair brush head ensures that the watercolor pen remains intact and not be sprayed, smeared or smeared during use. Convenience-light, portable, and an essential tool for artists and hobbyists, and can be used , in the studio or . Easy to clean: just wash with water after use.