For instance, this past Monday I had my regular bucket of #2 that came out of motors, tv's etc. Then, I had found some sort of round, hat shaped copper thingy. I have NO idea what it was, it was dark when I found it so I didnt even realize it was copper until I got it home. I thought it was aluminum. Anyways, when I took it in it weighed up as #3 copper with a 15 cent lower price difference.

I know the difference between number 1 and number 2 copper is mostly the thickness and this thing I found was thin, and it had ''pound'' marks all over it.

At the end of the day though, isn't all copper the same? Or are the different ''numbers'' of copper also different grades?