Detail 01
32.8 mm cup diameter; 8.3 mm throat
These are the AT4U version’s specified cup and throat measurements.

Independent shopping perspective
Denis Wick’s gold DW4386-AT4U is an Aaron Tindall Signature Ultra Series tuba mouthpiece with a Geib-style profile. Its 32.8 mm cup diameter and 8.3 mm throat are specified for the AT4U version, which is aimed at rotary CC tubas and designed to enhance upper overtones. The carefully engineered shank is intended for instruments using the standard Euroshank-type fitting, where matching the mouthpiece to the leadpipe is important for response. The Ultra Series design also targets powerful sound across the full register, articulation, endurance, and intonation.

Strong match
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
These are the AT4U version’s specified cup and throat measurements.
Detail 02
The AT4U is specified for rotary CC tubas and is designed to enhance upper overtones.
Detail 03
Its shank is engineered for tubas with this fitting type.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
The AT4U has a 32.8 mm cup diameter and an 8.3 mm throat.
It is specified as ideal for rotary CC tubas.
The shank is engineered for tubas with a standard Euroshank-type fitting.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.