Lead-free, uncleaned soldering iron, 96.3% tin, 0.7% copper and 3% silver, 0.032 inch diameter. (2 units). The alloy exceeds J-STD-006C and meets ASTM B 32 purity requirements. Flux meets J-STD-004B. The resin spreads like rosin activated flux. Approximately 14% more weight than leaded solder cables.