Japanese Horn Mouthpiece Basic Model 30 A rare vintage item from 40 years ago. Inner Diameter: 17.03 Throat: 4.40 Easy to blow, with a sound like a Vienna horn, and easy to play in the high register. Still popular today. * There are truly minor insertion scratches and polishing marks, but it's in remarkably beautiful condition, considering it's 40 years old. I don't think you'll find one in better condition! Thank you very much.