Professional chisel tip lasts 50% longer on abrasive surfaces than regular chisel tip pens. Non-slip barrel and easy-off cap for easy use even when wearing gloves. Oval barrel won't roll off flat surfaces. Marks on almost anything, including wet and oily surfaces, wood, stone, plastic and more. Marker Type: Permanent; Color(s): Black; Tip Type: Chisel; Ink Types: Non-Washable.