This thing makes a lot of racket, I have to move it to another room to use it. It must be the ring, my other stir bar doesn't have a ring and it's very quiet.
I accidentally dumped my other stir bar in the garbage disposal. It got pretty tore up so I bought this one to replace it. My old one did not have a ring on it; this one does. All I can say is that I had to move my starter to another room because this is so loud. I'm going to look for another without the ring. On the plus side it does seem like it stirs better but that doesn't really matter to me.