Chalk Brights Liquid Chalk Markers are great on all nonporous surfaces: whiteboards, blackboards, glass, glazed ceramics, plastics as well as Teacher Created Resources' Clingy Thingies & Better than Paper products. Versatile tips make it easy to produce narrow & precise lines or thick & bold lines as needed. Featuring opaque pigmentation & a range of bold, vivid colors, their water-based, non-toxic, wet erase ink removes easily with a damp cloth or sponge. Marker Ink Type: Washable; Marker Tip Type: Reversible Bullet / Chisel; Marker Tip Size (text): Broad; Marker Color(s): Assorted.