Jumbo-sized, permanent ink marker with giant 5/8" chisel tip covers large areas easily in big, broad, smooth strokes. Marker writes on almost anything: cardboard, illustration board, concrete, wood, plastic, metal and many other surfaces. Great for making eye-catching signs and posters. Rich, dark, low-odor ink is quick-drying, water-resistant and rub-resistant. Generous nontoxic ink supply lasts a long time. ACMI certified ink conforms to ASTM D4236.