Key : Bb.
Series : Challenger 2.
Bore : .459" / 11,66 mm ML bore.
Silver-plated finish, reversed leadpipe.
Bell : 4.921" / 125 mm #37.
Valves : 3 top-sprung hand-lapped Monel pistons.
Water keys : 2 lever-style, forged (main tuning and 3rd valve slide).
Finish : Clear lacquered or Silver-plated.
Case : Double hard wood-shel.