The BBb (BE187) models are free blowing with an ease of tone production and an even response. The mouthpipe is carefully positioned to give optimal playing comfort while the valve technology produces complete accuracy and reliability. A lightweight design makes these tubas exceptionally easy to hold and carry, with their depth and quality of tone capturing the essence of the legendary Besson sound. - Key: : BBb - Ø bore: : .690' ( 17,53 mm ) - Bell: : hand-made in yellow brass - Ø bell: : 16' (408 mm ) - Valves: : 3 - Waterkeys: : 2 - Strap rings: : 2 - Finishes: : bright silverplate or clear lacquer