Very often clarinets need to be tuned in order to adapt the intonation to individual playing manners. If you then switch from one mouthpiece to another though, subareas of the intonation might change as well.
As a shim (spacer) between mouthpiece and barrel tunings rings can balance variability in intonation fast and efficient. We therefore offer tuning rings in various dimensions and strengths. The tuning ring stays on the mouthpiece to enable a quick switchover from A clarinet to Bb clarinet with always the same distance between mouthpiece and barrel.