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Michael Rath B1 1/4

TromboneIn Production
Precision Specifications
RIM DIAMETER28.1 mm
CUP DEPTHDeep
THROAT ∅7.3 mm
BACKBORE—
SHANKlarge
CUP SHAPE—
Rim Width—
Rim Contour—
Throat Drill #—
Materialbrass
Finishsilver_plate
Weightstandard

Recommended For

OrchestralClassical

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Resistance5/10
Rim Comfort5/10
Brightness5/10

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Reference Notes

B1 1/4 standard rim — 28.1mm rim diameter with 7.3mm throat, classic bass trombone proportions. 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.

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