5PCS 100G 0.6mm 63/37 Rosin Core Flux 1.8% Tin Lead Roll Soldering Solder Wire Use for instrumentation, mobile phone or electronic products and other high-end welding requirements Rosin core solder with a quick acting flux dissolves surface oxides for good wetting, leaving a non corrosive residue With a even flow to make for a neat solder joint 63/37 rosin core solder FLUX 1.8% Material: Tin Wire Weight : 100g/spool Wire diameter: 0.6mm