This pack of Edding chalk markers are ideal for writing on non-porous surfaces (e.g. dark boards, windows, glass). Create eye-catching displays and decorate glass and mirrors with these great pens. The water-based liquid chalk inside each marker can be wiped off with a damp cloth and the neon colours are really striking. Ideal for arts and crafts and small business, cafes and restaurants. . Pump system - shake before use, remove cap and pump. Water-based liquid chalk in high quality plastic barrel . Wipes off virtually all non-porous surfaces with a damp cloth . For writing and drawing on windows, dark/chalk boards, glass and mirrors . Outstanding writing properties with extra broad chisel nib, and valve-controlled ink flow