Detail 01
31.25mm cup diameter
Mid-large rim. More lip inside the cup than a 4 or 5, less stretch than the 32.5mm 1 models.

Independent shopping perspective
Silver-plated tuba mouthpiece in the 3L cup. A deep, wide-throated model for players chasing a big, dark orchestral sound.

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
Mid-large rim. More lip inside the cup than a 4 or 5, less stretch than the 32.5mm 1 models.
Detail 02
The widest throat in this range. Air moves freely for volume, but it takes more air to fill.
Detail 03
Adds low-end weight and darkens the tone. Trades away some articulation clarity and high-register ease.
Detail 04
Opens the sound further downstream, reinforcing the organ-like character rather than focusing it.
Detail 05
Slightly grippier and warmer feeling on the lip than gold, and standard on most brass mouthpieces.
Detail 06
Fits horns cut for a smaller receiver. Wrong shank sits too deep or too shallow and kills response.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
Same 31.25mm cup and 8.78mm throat. The XL has a wide, round rim for extra comfort. The L has the deep rounded cup for that dark, organ-like tone.
The 3SL soloist and 3XL are the models aimed at F tuba. The 3L's deep cup and large backbore favor bigger horns and darker low work.
Likely. The deep cup and 8.78mm throat reward a developed embouchure and strong air. The 4L is the model listed as a good fit for younger players.
Only if the receiver takes a smaller shank. Many large horns are cut for a large shank, so measure or test-fit before committing.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.