Okay, I have been saving these darn things up.. not too fond of pulling out the copper from them, but today ended up as the day to get'er done. I sawed opened one end of each so I could pull the wire out, and I noticed that about all of them had silver looking insides in the wires. Does that mean these are not made with copper wire? The outsides of the wires look like copper, but the insides are silver. Is this aluminum wire? Here are my photos:







Thanks for advice!