Bb key, same as regular Bb trumpet, accepting regular trumpet mouthpieces.
Currently available at Amazon USA.
Key: Bb
Bore size: M (0.453"; 11.5mm)
Bell material: Y (Yellow brass)
Bell size: S (# 37)
Bell thickness: S (0.024''; 0.6mm)
Bell diameter: 4.843" (123.0 mm)
Finish: L (Lacquer)
Leadpipe material: Yellow brass
Tube material: Inner / Outer Yellow brass Inner Yellow brass hard chromium plating / Outer hand slide Yellow brass
*The lastest version of Mini trombone is with "gold brass" hand slide crook
Accessories
Gig bag
CarolBrass® 7C Slim plastic mouthpiece
Polish cloth
SLIDE-O-MIX hand slide grease
User booklet