The Pentel Chalk Marker Wet Erase is an easy to erase marker with a chisel tip.The Pentel Chalk Marker Wet Erase wipes completely clean with a damp cloth while its chalk based ink adheres to dry surfaces, retaining its opacity. The Pentel Chalk Marker Wet Erase\'s gentle and acid free formula is ideal for use on blackboards, whiteboards, glass, ceramics, metals and non porous surfaces making it perfect for use on menu boards in pubs or restaurants, glass writing, advertising and for student or school use. . 10 to 15mm line width. Semi-permanent formula - won\'t run off in a light shower. Remove with a damp cloth or non-bleach based household cleaner, and a non-scratchscourer (may be difficult to erase from uneven surfaces)*. Valve-activated flow, no blobbing or leaking. Ideal for use on slate chalk boards and non-porous surfaces (e.g. glass). Perfect for fetes, canteens, pubs and clubs, crafts etc.. Pigment-based ink*This product is suitable for use on conventional slate chalkboards and glass. Do not use onvinyl, wood and painted MDF \'chalk\' boards.