Material: Lead-free solder wire with resin core, Sn99.3%, Cu0.7%; Wire diameter: 0.8mm. Resin flux: 2.2%. 2 rolls total weight 200g. Good Quality Solder Wire: Excellent welding performance to increase welding efficiency and quality. Good solderability in both electrical and thermal conductivity. Working Temperature: Solder wire melting point: 227 / 440.6. Working temperature: 320-400. Flows well and heats evenly, easy to use. Environmental Protection: Welding with less spatter, less smoke, and easy to clean. Applications: Designed for electrical repairs, such as mobile phones, radios, TVs, stereos, toys, motors, circuit boards, motherboards, and other electronic devices. Features: With the solder wire reel, soldering can be completed faster, saving time and effort. Flows well and heats evenly, easy to use. Good solderability in both electrical and thermal conductivity. Resin is uniform and correct; insulation resistance, spatter-free, and non-corrosive. Widely used in electrical and electronics, soldering parts such as circuit boards, electronic devices, and more.