Industrial strength. Contents: 1 Sharpie Professional Black Chisel Tip Permanent Marker. Permanent on most surfaces, including wet, oily, abrasive and non-porous surfaces. Stronger Professional chisel tip lasts 50% longer than the standard Sharpie chisel tip. Non-slip barrel and cap design make cap easy to remove when wearing gloves. Versatile chisel tip allows for two distinctive line widths: broad and fine. ACMI/AP - Art & Creative Materials Institute Certified. Conforms to ASTM D-4236. Nontoxic. Assembled in USA.