The Sharpie Chisel Permanent Marker marks on dry, wet, and oily surfaces, making it perfect for use on concrete, metal, PVC, threads, rods, and more.With fade and water resistant ink and a durable metal barrel, the permanent marker is designed for tough conditions at work, home, and anywhere else. Tough, durable, and built to last. Permanent marker with a metal barrel, durable blocked chisel tip for heavy use, marks on most surfaces even wet and oily, fade and water-resistant dye-based ink, line width 4.0mm