Designed for precision and durability, the Silver-Streak Pro refills from Markal are the ideal choice for professionals in welding and metal fabrication. These unique reflective leads provide clear, long-lasting marks that surpass traditional soapstone, making them perfect for a variety of applications including bridge fabrication, shipbuilding, and repair. Compatible exclusively with the Markal Pro Holder, these refills are crafted to perform on all metals, including clean, oily, or rusty surfaces, ensuring that your markings remain visible and effective even in challenging conditions. With their heat-resistant properties and robust construction, these refills are an essential tool for anyone looking to achieve high-quality results in their welding projects.