Yamaha Small Shank Trombone Mouthpiece 48A Silver Plated This is a brand new, unused mouthpiece that came with the alto trombone I purchased. It's considered one of the standard mouthpieces for alto trombone and can be used as a benchmark when selecting other mouthpieces. Personally, I find it easy to hit around high E♭. I apologize, but please refrain from negotiating a price reduction. I am not considering lowering the current price. --- Rim Inner Diameter: 25.25 mm Throat: 6.62 mm