I would rate these headphones a 5 if the plastic tubing evaporated in a reasonable amount of time, but the foul smell is still noticeable when I wear them, which is less than I want to use them because of the smell. I feel like I've traded chemical safety for radiation protection. Radiation protection is important to me, so I didn't send the headphones back. I hope that in a few months the gas emissions will go down to the point where I can no longer notice them. The sound quality is suitable for listening to instructional videos. I didn't listen to music with them. They appear to be well made. The only issue really is the smell and I'm not sure if the manufacturer had a selection of other plastic that didn't smell bad.
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