These Stanley Fatmax Chisel Tip Permanent Black Markers are ideal for marking out in all-weather and environmental conditions. They have a strong, durable chisel tip, which reduces wear and tear even when used on abrasive surfaces. They are water and oil-resistant. The Bi-material hand grip provides ease of use in all weather conditions, including when wearing gloves. It can be used to mark tools and equipment and for marking copper roofing material, gas pipe, black pipe, wood, metal, concrete, coating roofs and pipes, and welding.