Detail 01
Strength 4
Stiff. Takes more air and firmer embouchure, gives a darker centered sound and resists closing up when you push.

Independent shopping perspective
A box of 10 Bb clarinet reeds in strength 4, for advancing and advanced players who already blow comfortably on a 3.5.

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
Stiff. Takes more air and firmer embouchure, gives a darker centered sound and resists closing up when you push.
Detail 02
Sized and shaped for a Bb soprano clarinet only. Will not seat correctly on alto, bass or Eb mouthpieces.
Detail 03
Enough to break in several at once and rotate. Expect variation between reeds within any box.
Detail 04
A specific Vandoren cut. Reed strength numbers are not interchangeable across cuts or brands — a 4 here won't feel like a 4 elsewhere.
Detail 05
About $4.25 per reed. A reed in regular use lasts weeks, not months, so this is a consumable.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
If you're currently comfortable on 3.5 and want more resistance and a darker sound, 4 is the next step. If you're still building embouchure strength, stay lower.
No. These are cut for Bb soprano clarinet. Bass clarinet takes a larger reed.
Ten.
No. Strength numbers apply within a cut. Moving between cuts usually means adjusting a half step up or down to get the same feel.