YBB-621 YBB-621S
Key Bb Bb
Body Yellow brass Yellow brass
Bell Diameter 366mm (14 3/8") 366mm (14 3/8")
Bore Size 17.5-18.5mm (0.689-0.728") 17.5-18.5mm (0.689-0.728")
Height 825mm 825mm
Valves 4 front pistons 4 front pistons
Finish Clear lacquer Silver-plated
Mouthpiece BB-67C4 BB-67C4
Case Included Included