Chalk Brights Liquid Chalk Markers are broad-line markers with reversible tips for either thick or thin lines. They are water based, non-toxic, and wet erase. They clean up easily with water so you can change up your art with no fuss! They are great on all non-porous surfaces. Includes 8 markers, for ages 3 and up. Conforms to ASTM-D4236 &EN-71. Contains water, resin, and titanium dioxide (TiO2).