Nice to finally have something that goes all the way round, till now I was just using a small pipe that I'd cut a line in and wrapped it round the rim of my bell. This product it good because it is a continuous loop and doesn't leave anything exposed. My only observation is that it is a VERY tight fit, and quite difficult to get on, took me about 15 minutes, but I'd rather that than it be too loose.
All in all, very happy with it - it is completely colourless and clear too, so it's not noticeable in picture which is good for concerts.