Model BB300 provides a depth of tone and carrying power previously found only in sousaphones of a larger bore size. This all- fiberglass body model features noncorroding nickel-plated trim and 26" detachable bell. Its front-action valve assembly is completely removable for maintenance, and it is interchangeable with Holton's BB310. Genuine Holton mouthpiece is included and a silver-plated model is optional.

Specifications
Key: Bb
Bore: 17.45mm (.687")
Bell: Forward, 660.40mm (26")
Action: Bottom-spring loaded
Piston: 3, Monel
Waterkey: 1
Slide material: Brass
Mouthpiece: HTU335-18