50% tin 50% lead. This is the solder I use professionally because I think its the cleanest solder on the market.
Because it contains lead, it should not be used in applications where the project will be handled such as jewelry boxes or models.
Need more than one roll? Due to limited shelf space (and because we want to offer the largest collection of hard to find items anywhere), we carry a limited number of each item. We place orders on Mondays. If you'd like to order in bulk, let us know!