Antoine Courtois AC424BXA Bb/F- Tenor Trombone; Model: Florida; tenor trombone in tuning: Bb/F; unscrewable brass bell Ø: 216 mm (8.5") with innovative bayonet joint; conical bore: ø 13.88 - 14.30 mm (.547 - . 562"); "X shape" with edge bracing; Vibra bell® Hagmann; brass outer slides with nickel silver handpiece; this trombone was developed with Joël Vaïsse, solo trombonist of the Florida Orchestra; finish: clear lacquer; flat case with "Florida" design