4 Black Liquid Chalkboard Markers with Built-In Eraser By Label Me Chalk Includes 4 fine tip quick drying pens cleans easily using the eraser or damp cloth Works on smooth, non-porous surfaces such as glass, plastic & vinyl - endless uses Long lasting, brilliant ink prevents smudging & providing a premium, quality finish Perfect for restaurant windows, canning jars, labels, artists & office supplies Non-toxic and safe for children to use with a 100% lifetime guarantee