massmall Sn63 Pb37 Tin Lead Rosin Core Solder Wire for Electrical Solderding 0.0119inches(0.3mm)0.143 lbs(65g) Alloy:Tin 63% Lead 37%. Melting Point: 361F/183C,Flux: 2% . Wire Dia: 0.3mm(0.0119inches) .Gross Weight: 65g/0.143lbs. Perfect combination of tin and lead, Lower melting point, more smoothly soldering, much shining soldering point.Good wettability, conductivity, thermal conductivity and easy to be tin-plated. Computer, precision instrument, communication instrumentation, electronics, micro-technology and other fields with high requirement for welding.