Will this be a cautioning amount of copper exposure?

I'm looking to have a Celtic, metal ponytail holder. I have my eyes set on this one:

Copper needs to be in contact with your skin to be absorbed. Copper bracelets are a popular item. Don't worry about copper hair holders. They're harmless. You should be more worried about the EM field in your cellphone, pressed against your ear. Those can cause brain cancer.