The silver striped round refill makes marks on metal and oily surfaces and maintains its performance under high welding temperatures; compared to soapstone, welding pen marks are harder to erase. Erasable and conspicuous: These pencil refills are water-soluble and can be wiped with a damp cloth when you mark a mistake or make the spot more beautiful and traceless; Drawing on dark surfaces is no longer a problem Each welder's pencil has a built-in pencil sharpener to quickly sharpen the lead, and there is a clip on the can be fixed on your clothes, bringing you a lot of convenience Works on a variety of surfaces: Almost any material or texture can be marked with this universal woodworking pencil, such as oily, rough, smooth, wet, dry, cold or rusty surfaces, suitable for construction, cars, bowls, metal, Plastic, glass, wood and paper, Manufacturer: Littimoon