Chalk Marker With Block Tip 5+15 Mm For Opaque Designs On Windows And Other Closed Surfaces. Writing Colour Red. The Odourless Liquid Chalk Is Erasable From Almost All Glossy Surfaces With A Moist Cloth. The Chalk Marker Can Also Be Used On Rough And Absorbent Media, E.G. Paper And Cardboard, But Cannot Be Wiped Off Again.