Horrible quality! Lasted less than a week. They?re too small, and after only wearing them for one day the strap in the back ripped off. I have used "muscle clamps" originals for years, saw these on Amazon at a ridiculously low price and in PINK. I purchased this otoscope to use on myself because I suffer from ear infections and ear irritation often. They are my new go to buds. I would have ate it so many times in the past month if I wasn?t able to catch myself. This is a single unit. Theyre comfy, but wide all around n no arch support. Strange sizing.