I bought them 6 months ago. Within 2 months, the gray part showed up, as did other buyers. I didn't really bother it because it just pops up again. One thing that really worries me is that they are uncomfortable. So if you wear them in your ear for more than 45 minutes you have to take them out as they start to hurt the ear (maybe my ears are smaller). The last straw was that this week my left bud burned out. I can't hear anything about that at the moment. So I'm leaving a review because they were so bad and I bought new ones today (different brand).
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