While being reluctant to offer a negative review, I had high hopes when ordering and receiving two full sets of these rings for use on a Yamaha 9000 Recording kit and also on a Yamaha Custom Tour kit.
The rings overlapped the drum hoops on the 16 inch toms, producing a buzzing rattle when the drumhead was struck. In addition, when placed on 12 inch and 13 inch toms, the rings were slightly short of the drum hoop, resulting in a similar buzzing sound.
As stated earlier, I am sorry not to feel able to offer a more positive review.