Quality Material: The solder wire is made of high-quality electrolytic tin, free of impurities, making it safe and reliable for long-term use. It produces minimal resin splash during soldering.High Performance: Composed of 63% tin (Sn) and 37% lead (Pb), this solder wire offers excellent performance. It helps increase soldering speed while reducing the thermal impact on components, resulting in significantly reduced soldering time.Low Melting Point: This solder wire has a low melting point between 183°C and 245°C. It is versatile, low-corrosive, and provides a bright, clean solder joint while preserving sensitive electronic components.Four Spools of Solder Wire: This set includes four 1mm diameter spools weighing 20g, 30g, 50g, and 100g, providing a comprehensive solution for various soldering tasks. The spools are designed for durability and long-term storage.Versatile Applications: Featuring built-in flux, this solder wire is ideal for general-purpose soldering. It is well suited for electrical DIY projects, repairing wires and cables, and maintaining electronic equipment such as air conditioning systems.