BNTECHGO 3Pack Solder Wire Dia.1.0mm/0.039Inch 63% Tin 37% Lead 1.8% Flux Rosin Core Net Weight 0.71 Oz/20g BNTECHGO solder wire 63% tin 37% lead,rosin core 1.8 percent flux. Solder wire diameter: 1.0mm/0.039inches;1 piece solder wire net weight: 0.85 ounces/24g. The plastic tube to protect from dirt and moisture. Package includes: 3 Pack Solder wire.