Drove an hour to a scrapyard last week since the one 10 min away closed (Get it while you can!). Saw a new item in the scrap pile. It was what appeared to be multistrand copper wire, approximately 1/4" in diameter, surrounded by a 1.5" square, very poor casting of heavy metal. The casting was extremely "bubbly" and irregular. There was also a broken section that showed extremely course grain structure radiating out from the center wire and perhaps some purple oxidation. Any ideas on what this is?