Metal strips on roof

I found metal strips along the top of the roof. It is not flashing. Its about 2 inches wide. I have never seen this before. Is there a reason. roof 2
Roof 1

Zinc strips that help deter moss growth.


If it is zinc it is for fungi control.

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I see…They sure could use a LOT MORE. There was a lot of moss in many of the areas with out them.

Thanks for your guys help.

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Sounds like a gimmick to charge more for the install!

Sort of like “gutter guards” ? Does it, or does it not work?