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I use these for the last six years as noise protection for up to ten hours a day and never encountered any problems. They are much easier and comfortable to use than the cheap foam plugs because they are custom made and don't disturb the blood currant in your ear.
Nonetheless I have to buy new ones now because the form of many ears changed (that was to be expected) and now they started being a nuisance after a few hours but that is a real good investment in terms of comfort and health
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