Jumbo-sized, permanent ink marker with giant 2/3" chisel tip covers large areas easily in big, broad, smooth strokes. Marker writes on almost anything: cardboard, illustration board, concrete, wood, plastic, metal & many other surfaces. It is great for making eye-catching signs & posters. Extra-large barrel houses a generous, long-lasting ink supply. Permanent ink dries fast. Rich, dark, low-odor ink is also water-resistant & rub-resistant. Generous nontoxic ink supply lasts a long time. ACMI certified ink conforms to ASTM D4236.