What do scrapyards buy aluminum gutters as?

Are they classified as extruded, sheet, cast?

Gutters can go with alum siding. Pays more than sheet or extrudid around here

Depends on your Yard but mine takes them as Aluminum Siding or Old Sheet Aluminum.

I know this is an older thread, but it still deserves another comment...

Recently I got some gutters that appeared to be aluminum (nonferrous, very lightweight, etc.). The body of the gutter was indeed aluminum but the end cap piece was steel. So I have to cut off that end piece to get an aluminum price out of it. Unfortunately, it doesn't come off that easily.