Size and IngredientRosin core lead-free solder wire; the diameter of the electric welding wire is 1.0mm; the metal wire welding wire weighs 100g. Sn/Cu: 99.3%/0.7%; Flow: 2%. Solder Wire has less smoke and rosin spatter when soldering. Good Quality Solder WireFlows well and heats evenly, easy to use. Good welding capacity both in electrical conductivity and in thermal conductivity. Excellent soldering performance. Low melting pointThe soldering iron wires melting point is 227 degrees Celsius (440.6 degrees Fahrenheit), flows well and heats evenly, easy use. With the solder wire spool, soldering can be done quickly. Scope of applicationThe tin lead solder wire is designed for DIY, home improvement, repairing cables, radios, televisions, VCRs, stereos, headphones, motors, toys, circuit boards and other electrical devices. Lead Content: Lead Free Free lead: Sn: 99.3%, Cu: 0.7% Rosin: Flux 2.0% Melting point: 227 / 440 Wire diameter: 1mm (0.039inches) Gross weight: 100gram/0.22lb How to solder: 1. Prepare solder wire and electronic soldering iron. 2. Contact the soldering iron with the soldering point. 3. Place the solder wire over the solder point when the solder is heated to the temperature to melt the solder. 4. When a certain amount of solder is melted, remove the solder wire. 5. Remove the electronic soldering iron at an angle of about 45 when the soldering point has been totally wetted by the solder. Package includes: 1 x 1mm lead-free solder wire