Plumbers lead, x-ray lead, along with a bunch of others, if you don't have a supply you can go to ebay, there is a seller there that you buy 10lbs for 20 bucks with the shipping, you get about 12 lbs total but what makes it good is the lead is clean, when I drop the ingots in my pot I get next to no slag or dross. The slag is the impurities that float to the top of the pot and need to be skimmed off. I buy it off the same seller, once a year as I have a free source but what I use the super clean lead for is to mix with wheel weight lead, because I know this is pure soft lead I can mix with wheel weights to make a harder alloy for my football jigs and other types of jigs that will be pounding rocks, it just makes them a little more durable and it isn't required, it is something to do after you have it down and poured for a few years.