Copper BB

Also known as "shiny"

The highest grade of copper scrap, defined as clean, unalloyed, and uncoated copper wire or cable that is at least 16-gauge thick and free of insulation, paint, and tarnish, exhibiting a characteristic shiny, reddish-orange appearance. It is at least 99% pure, with some sources stating it can reach 99.9%

It must be clean, unalloyed, and uncoated, with absolutely no insulation, tarnish, paint, or other impurities. It must be wire or cable, not copper pipes or other copper items. It typically needs to be at least 16-gauge thick to qualify.