Tin Lead Solder: The 5 Core tin lead Solder Wire features a rosin core for evenly distributed flux without the mess of applying it separately. Easy to use: The soldering wire is easy to work with and offers excellent electrical and thermal conductivity, making it compatible with most soldering irons and equipment. Versatile application: The Lead soldering wire is ideal for a variety of soldering applications, including circuit board work, DIY projects, home improvement, and repairs of cables. Efficient soldering: The solder wire boasts a melting temperature range of 419 F to 428 F, which results in shorter soldering times. The wire diameter is 0.6mm. The brand you can trust: At 5 Core, Customer satisfaction is our priority—a proven track record of delivering the highest quality product since 1984. Product Specification: Alloy: Tin 63% Pb 37% The wire diameter: 0.6mm (0.023inches) Use case: Electronics industry, home appliance manufacturing, automobile manufacturing, etc.