This tube of solder is just the right size to keep in a toolkit. The solder is lead free 96.5/3/0.5 (96.5% tin, 3.0% silver, 0.5% copper) and features a “no-clean” water soluble rosin core. We recommend this solder for people with experience soldering as the melting point on this solder is quite a bit higher than leaded solder. The tube has 15 grams of solder measuring 0.031″ diameter.