All of the findings on this page are solid copper -- there is no other metal underneath the copper layer you see on top.
Most of these items are raw (bare) copper. However, a few (such as the copper tube-top bails below) are solid copper, with a bright copper plating over the top, giving them a nice uniform finish. Why? Apparently where they are located, it's easier to plate the finished bail, rather than polish the sheet they are formed from.