ENTAI Solder Wire 0.6mm/0.024Inch Diameter, 63%SN(Tin), 37%PB(Lead), Flux : 2.0% Tin Lead Rosin Core Soldering Wire Reel (1.6 Oz/50g) Material : 63%SN(Tin), 37%PB(Lead); Flux : 2.0%. Solder joint reliability, clean, beautiful. Low ionic contamination. Few residues after welding. High insulation resistance after welding.