Yamaha 11B4 Trumpet Mouthpiece – Semi-Shallow Cup, Brilliant Tone

Yamaha Model 11B4. A somewhat shallow cup and medium rim for extra endurance. Brilliant tone. Similar to a Bach 7D. Inner Diameter = 16.46mm. Contour = semi-flat. Thickness = standard. Cut Depth = semi-shallow. Throat = 3.65mm. Backbone = semi-narrow.