YAMAHA 42 trombone mouthpiece for small bore trombones. This is a discontinued item, no longer listed in the Yamaha catalog. Therefore, the specifications are unknown, but it has a very small cup for a trombone mouthpiece, making it easy to play high notes. It might also be good for alto trombone. There are fine scratches overall. The shank is not perfectly round, but it doesn't affect use. It's very old, so the plating condition is commensurate with its age.