Shires GBA 4G
TromboneIn Production
Precision Specifications
RIM DIAMETER25.4 mm
CUP DEPTHMedium
THROAT ∅7.04 mm
BACKBORE—
SHANKlarge
CUP SHAPE—
Rim Width—
Rim Contour—
Throat Drill #—
Material—
Finish—
Weight—
Recommended For
OrchestralAll Around
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Special Features
- GBA Series
Reference Notes
Shires GBA 4G appears in the Trombone catalog section with 25.4 mm rim, Medium cup, 7.04 mm throat, and large shank. Database tags list it for Orchestral and All Around use. Noted features include GBA Series. Use these measurements as a comparison starting point: fit and response still depend on the player, dental structure, instrument receiver, and each manufacturer's measuring method.