Radioisotope containers. I shot a ton of it in my old musket competition days. Pure and as soft as it can get. Wont be radioactive but wash your hands well with soap and cold water after handling it.
Friend who works is a Rad Tech gets me a bunch of these. Haven't used they yet, preferring to wait until I have a bunch more. Will have to figure out how to remove the plastic (?) casing before smelting.
