Vktech 63/37 Tin Lead Melt Rosin Core Flux 1.8% Soldering Solder Wire 50g 4 Sizes (0.8mm) Good solderability, insulation resistance, No spattering and Non-corrosive Widely used in electrical and electronics, solder parts like circuit board, electronics devices and others Suitable for instrumentation, mobile phone or electronic products and other high-end welding requirements Material: Tin Wire 63/37 rosin core solder