These liquid chalk markers provide the best liquid chalk available! Bright and pigmented, they are ready to use on a plethora of surfaces such as chalkboards, metals, plastics, and even glass. Even though the chalk is made of professional quality ink, when applied to non-porous surfaces and materials, it can easily be erased by using a moistened paper towel. Presto! The surface is as good as new, and there isn't even any leftover residue! These best liquid chalk markers even include a tip that can be reversed in order to change the width of the stroke drawn. Since these markers have the best liquid chalk, they can not be mixed with any other liquid chalk media.