YAMAHA EUPHONIUM 51D MOUTHPIECE S/SHANK

Yamaha Model 51D. An even deeper cup than the 51 for a heavy, rich tone.Similar to a Bach 5G, but with a deeper cup. Inner Diameter = 25.24mm. Contour = standard. Thickness = standard. Cut Depth = semi-deep. Throat = 7.11mm. Backbone = semi-wide.