Oatey Acid Core Solder in alloy composition 95/5 (95% TIn, 5% Antimony). Acid Core Solder is a general purpose solder for repairing galvanized gutters, filling metal seams and other general repair. Acid Core Solder should not be used on electrical parts. Highlights: Size: 1/4 lbs. 0.081" gauge Lead Free Alloy of 95% Ti