Yamaha YBL-620 GE Bass Trombone, Bb/ F/ Eb (D)- Bass Trombone, Off-set valves, With separate knobs (as with in-line), Bore Ø: 14.3 mm, Gold brass bell: 241 mm (9-1/2""), Nickel silver slide, Gold lacquer finish, Incl. D- slide extension, case and 58 mouth piece