Detail 01
B chamber (medium)
Middle-of-the-road resistance and core. Less spread than the large A chamber, less bright than the small C.

Independent shopping perspective
Medium-chamber, medium-facing hard rubber-alternative clarinet mouthpiece at a low price. A step up for students on a stock mouthpiece.

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
Middle-of-the-road resistance and core. Less spread than the large A chamber, less bright than the small C.
Detail 02
The shorter, closer facing of the range. Easier to control, works with softer reeds, less volume ceiling.
Detail 03
Molded plastic rather than hard rubber. Consistent piece to piece and shrugs off drops better.
Detail 04
Medium chamber with close facing is the safest pairing here — the most forgiving of the letter/number grid.
Detail 05
Standard clarinet shank. It will not fit bass clarinet or saxophone necks.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
The letter is chamber size — A large, B medium, C small. The number is facing length: 3 is 45, 5 is 50, 7 is 55. B3 is medium chamber, closest facing.
No. You get the mouthpiece by itself, so reuse the ligature and cap from your current setup or buy them separately.
The close 45 facing generally wants a softer reed. Most players land in the 2 to 3 range rather than the harder strengths.
It is a more consistent molded piece with a defined chamber and facing, which is why it is a common first upgrade from a rental mouthpiece.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.