FLUGELHORN MOUTHPIECE 16F4

"Yamaha Model 16F4. Same rim configuration as the 16C4 trumpet model, thus interchangeable. a large innerrim diameter. Similar to a Giardinelli 3FL. Inner Diameter = 17mm. Contour = semi-flat. Thickness = standard. Cut Depth = deep. Throat = 4.3mm. Backbone = standard."