High-quality liquid chalk markers. Once dry, they do not smudge or fade. They are dirt-resistant and can withstand light rain. User-friendly: shake briefly, press the tip until it is colored, write, and let it dry for a few minutes. They can be easily wiped off with a damp cloth, allowing you to quickly start writing again. They write on all non-porous surfaces such as chalkboards, glass, metal, plastic, and much more. Safe for health.