For 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 v more→alve action for a smooth, controlled ink flow. Ideal for displays, decorations, menus, information and more, the chisel tip writes a variable line width of 1.0 - 2.0mm. This assorted pack of 4 chalk markers contains red, yellow, blue and white.Liquid chalk markerIdeal for use on blackboards, whiteboards, glass, ceramic, metal and non-porous surfacesFor indoor and outdoor useValve-activated flow, no blobbing or leakingChisel tip for a 1.5 - 4.0mm line widthAssorted colours: yellow, red, blue and