I've had a musician's plug for awhile now, mine is about 3/4 inch & fitted to your ear canal- just a small tan rubber piece is outside the canal so you can pull it out.
I personally don't like it much, though it does work to diminish the noise level. (I'm excused from large meetings at work via a doctor's note).
I find when lots of people are really loud it doesn't help much, but will help in a setting where people are talking at a normal level, places like a restaurant,
concert. You are better able to hear the person next to you, They come in 2 levels: 1 decreases sound by 15 decibels (the one I got) & the other decreases
sound by 25 decibels.
I don't notice it cut down on tinnitus at all, that's inside the head!
I got mine at a university hospital - the ear, nose throat dept. It cost me $75.00 They take a mold of your ear canal (not deep), then they'll call you when it's
ready & show you how to place it. Quite easy.
Hope that helps Donna, Nancy