Lead-Free Solder Wire: Lead-Free Solder Wire with Rosin Core. Size and Composition: Wire is 0.8mm (0.0315 inch) diameter, 99.3% tin, Cu 0.7% and a gross weight: 100 g / 0.22 lb. Operating temperature: wire melting point is 441F / 227C; Good circulation, uniform heating, easy to use. Functional welding wire: good welding ability in both electrical conductivity and thermal conductivity. Scope of application: DIY electrical engineering, home improvement, cable / television / radio / disinfection / toy repair / circuit board and other electrical equipment and other very good welding performance. How to solder 1. Prepare solder wire and electronic soldering iron. 2. Contact the soldering iron with the solder joint. 3. Place the solder wire over the solder joint when the metal to be soldered is heated to the temperature that can melt the solder. 4. When a certain amount of solder has melted, remove the solder wire. 5. Pull out the electronic soldering iron at an angle of about 45 when the solder joint is completely wetted with solder Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store