60% tin 40% lead. 60/40 has a low melting temperature yet buffs to a great shine, making it a good choice for stained glass panel work.
It is a great choice for beginners as well as production artists.
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.
Also available in money-saving five packs in my store.