Bach mouthpieces are among the finest in the world, and the 3519GP is a continuance of that tradition. This mouthpiece features a 9 cup, deep with a 16.05 mm diameter and a medium wide rim, lowered toward the outside. It produces a colorful, liquid tone that is uniform over the entire range of the horn, desirable for all-around work. The gold plating is preferred by many players for a variety of reasons, from feel to appearance, to allergen considerations.