J&F Rosin Core Solder 63/37 Leaded Electronics Solder, 0.6mm (12.5g) Rosin Core 63/37 Tin Lead Solder Ratio of 63% Tin 37% Lead has the lowest melting point of any other tin lead mixture True melting point of 183 Degrees Celsius or 361.4 Degrees Fahrenheit Diameter: 0.6mm Weight: 12.5g (0.45oz)