Bb/F-Trombone mod.ASL-420G, by Arnolds & Sons
ML-Bore
Goldbrass bell plasma welded
Reinforced bell with bead wire
Nickel silver inner and outer slide
Standard Quartvalve
Closed wrap F-attachment
Traditional waterkeys
Bore: 13,33 mm
Bell: 21,59 mm
Goldbrass lacquered
6 1/2 AL mouthpiece and comfort case