The Vandoren Masters tuning rings are designed to fit between the mouthpiece and barrel of the clarinet. They come in a pack of two, in two different sizes:

• 1.5mm
• 1.75mm

These are designed to be used separately to help precisely lower the overall pitch of a slightly sharp mouthpiece. Ideal for clarinettists tuning to A=440 who are finding their standard mouthpiece tends towards A=442, which is fairly normal for any European-made mouthpiece.