Comfortable
I bought these to use in the cartilage of my upper ear. I was wearing one with a regular back and it hurt my ear when I slept on my side. I wanted one that I didn't have to take out every night. So I bought these with the round screw-on back. They work perfectly. Just be careful to not drop the back when you put them on, you may never find it! The only draw-back is putting that tiny little screw-on piece on the back. It can be tricky.
Rating: 5 stars