YAMAHA trombone hard case for small or medium-small bore (with mouthpiece)! This is the case that came with the Boosey & Hawkes silver-plated small bore straight tenor trombone I'm currently using for work! Since the Boosey instrument is a bit larger, it probably fits a medium-small bore straight tenor from the original YAMAHA perfectly! Even with a small bore straight tenor, if there's any space, you can probably use cushions or something to eliminate the play! Accessories include a YAMAHA small bore mouthpiece, a 48. If you're looking for a hard case, I'd be happy if you would consider purchasing it!