Trombone Mouthpiece Yamaha 51B. I picked up a large variety of never used instrument mouthpieces from a retired Yamaha American division public relations employee. While I know these were never used I am selling them as used as they have been sitting around for years and may have tarnish. The tarnish is easily removable but I will leave that to the buyer. The mouthpiece pictured is the exact one you will be receiving. Please feel free to ask any questions. Thanks for looking