FRENCH HORN MOUTHPIECE 29D4

"Yamaha Model 29D4. Double-cup combining medium and extra deep “V” cups. Fairly small inner diameter, but with a large throat for rich tone. Similar to a Holton VDC Inner Diameter = 16.88mm. Contour = semi-flat. Thickness = medium. Cut Depth = semi-deep (Double-Cup). Throat = 4.5mm. Backbone = semi-narrow."