These are called half round and are copper you need to talk to a coppersmith or roof/gutter contractor that specializes in copper installs.

Thanks. Sorry its taken a few days to reply. Been dealing with food poisoning. I thought it might be copper used. Even though its nice, I wanted to use galvagnized half rounds. In my photos attached, I wanted to reuse some of my roof peap caps I've salvaged from a barn and some out buildings I've demoed on my place. Would that be a doable project for a gutter company to do

Even though that wasn't my picture I could tell you that they were copper. I think it may be difficult to hire a trougher that will install ridge cap as a trough system. I'm sure anythings possible though you just have to find the right installer.