Pentel Liquid Chalk Marker Chisel Tip Assorted (Pack of 7) SMW26/7For use on conventional slate chalk board and glass these Pentel Markers contain liquid chalk which removes easily with a wet cloth. Suitable for both indoor and outdoor use the markers feature a valve action for a smooth controlled ink flow. Ideal for displays decorations menus information and more the chisel tip writes a variable line width of 1. 5 4. 0mm. This assorted pack of 7 chalk markers contains red yellow blue white green orange and purple.