Bistro Chalk Marker 6mm Point Set 4/Pkg - UCHIDA-Bistro Chalk Markers. Create a dustless smooth layer of rich fluorescent colors that are water-based, non-toxic and fade resistant. For use on black boards, glass, backlit boards and more, just wash off with a damp cloth. This package contains four markers with 6mm tips-- one each of black, blue, red, and white. Conforms to ASTM D4236. Imported.