Give these chalk markers to your little ones for creative fun time. You can use these markers on chalkboards, ceramic surfaces, glass and other non-porous surfaces. These wet-erasable markers are ideal for drawing motifs, writing messages and doodling. Details: Includes assorted metallic colors (blue, pink, green and silver) 9 packs (4 markers per pack, 36 total markers) Wet erasable Works on non-porous surfaces Conforms to ASTM D-4236