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It will work (to a certain extent)...copper has been used for years.Can't remember the exact reason behind it... but its pretty inefficient ie amount of copper /to killing area. I think you would have to have so much copper up there ,It would not be there in the morning. Zinc is cheaper that would be about the same.Might be a good add on ,like hedgehogs.
Why 8s the website mossfree but the product they sell called moosfree?