This is a Randefalk tenor horn (alto horn/tenor horn) mouthpiece. The size is R2. It feels similar in size to a Denis Wick 2. This is a one-piece model that is no longer sold. The gold plating on the part that touches the mouth is slightly worn (please be aware of this). There are also some light scratches on the shank from use. The current list price is around 25,000 yen (excluding international shipping). It is not available in Japan. Inner Rim Diameter: 18.90 mm Rim Diameter: 30.60 mm Bore Size: 5.0 mm Cup Depth: 26.80 mm