Detail 01
13 Series
Cut for the lower A=440 pitch standard used in the US, rather than the A=442 common in Europe.

Independent shopping perspective
A Bb clarinet mouthpiece for players replacing the stock piece that came with a student horn, or standardizing on American A=440 pitch.

Strong match
Consider the trade-offs
What matters in use
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 01
Cut for the lower A=440 pitch standard used in the US, rather than the A=442 common in Europe.
Detail 02
Standard Bb clarinet taper, so it also seats on an A clarinet. It will not fit bass or Eb.
Detail 03
No reed, ligature or cap. Any standard Bb clarinet ligature and cap will clamp on it.
Detail 04
Pro-tier price on a part that outlasts the horn — it moves with you to your next clarinet.
Detail 05
Tip opening and facing length are matched as a pair, so reed strength usually has to be re-tested after switching.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
The 13 Series is cut for A=440, the American pitch standard. The regular M30 is set up for A=442, used across much of Europe. Same model otherwise.
No. It is the mouthpiece alone. Any standard Bb clarinet ligature and cap will fit, so most players keep the ones they already own.
It fits any standard Bb clarinet barrel, and an A clarinet uses the same taper. Bass, Eb and contra clarinets need their own mouthpieces.
Reed and mouthpiece work as a pair, so plan on adjusting. Start with the strength you play now, then move a half step in whichever direction feels stuffy or thin.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.