What is the advantage of having a copper mask?

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Ever since the pandemic there were also new adjustments to the new normal including as well the products. One of it is the facemask that now we are even required to wear it when we go out. Now there were a lot of facemask that are being promoted it can be disposable, reusable and other more kinds. For those who are using the copper mask what is the advantage now in terms of protection? But the at the same time why some hospitals like Makati Medical Center in Manila are not allowing it just because there is whole down to the chin? What are the more advantages of wearing the copper mask?