Economical, high-strength pencil is ideal for marking all types of metal surfaces ï¾– even oily, rusty or wet surfaces. Marks resistant to torch flames, will not rub off or burn off like soapstone. Highly visible marks illuminate when cutting or welding. Durable marks will not scratch or abrade metal surfaces. Hexagonal shape reduces barrel roll. Pre-sharpened pencils can be easily resharpened with any standard pencil sharpener. Highly visible silver color for darker surfaces.