Horn mouthpiece, Yamaha Shiro Ide Model #2. Silver plated. Purchased at Yamaha in Ginza. I used it with care, but I'm selling it because I've changed instruments and no longer use it. It shows signs of use, but I took good care of it, so there are no dents. Please check the photos. Inner rim diameter: 17.81mm Throat diameter: 4.09mm Thank you for looking.