Yamaha Trombone Mouthpiece 48A

Yamaha Model 48A. The 48 rim combined with a very shallow cup. For alto trombones. Bright tone with good volume. Similar to a Bach 6-1/2 rim, but with a shallower cup. Inner Diameter = 25.25mm. Contour = standard. Thickness = standard. Cut Depth = shallow. Throat = 5.32mm. Backbone = semi-narrow.