Pentel Arts Wet Erase Chalk Marker, Jumbo Tip, White Ink, Box of 12 (SMW56-W) High-Opacity liquid chalk marker produces solid lines you cant see through Writes on most dry, non-porous material such as glass, metal, menu boards, plastic, porcelain, glazed pottery, and fiberglass Acid-free, chalk-based ink writes on dry surfaces and produces clean, solid lines Decorate windows and mirrors; temporarily label storage containers and gardening supplies; or create unique crafts Box of 12 chisel tip markers