PERANTUCCI PT-48 Gold Plated Cup: 33.0mm, conical and deep Rim: 8.0mm, narrow rim with a sharp inner edge Throat Bore: 8.3mm The PT48 model is a Helberg model mouthpiece that produces a rich, symphonic sound. It is especially recommended for players with a strong embouchure, designed for large CC and BBb tubas. *Quoted from Japan Tuba Center* It also works with larger instruments like the York model, producing a thicker, richer, and louder sound. Due to the rising price of gold plating, the current new gold-plated retail price is ¥48,400. There are scratches on the rim, but they do not affect performance. Used ones are rarely available even at musical instrument stores, so please consider it if you are interested.