Yamaha's Standard Series mouthpieces are produced with the most advanced computer design and manufacturing technology. These mouthpieces are crafted for unmatched precision, smooth attack, secure control, and easy playability. They have an ideal weight for all-around use and are available in a variety of configurations to suit every player. Trombone Mouthpiece (Large Shank) Model Rim Cup Depth Throat Backbore Playing Charateristics Inner Diameter Contour Thickness 4724.98standardstandardstandard5.85standard Smaller inner rim diameter than the 48. Extended endurance. Plenty of volume. 4825.25standardstandardstandard6.62semi-narrow Well-balanced rim and cup with a fairly narrow backbore. 48D25.25standardstandardsemi-deep6.62semi-narrow Same rim as the 48 with a relatively deep cup. Rich low register with a soft tone. 51B25.23standard standardsemi-shallow6.92semi-wide The 51 rim with a relatively shallow cup. Powerful sound. 5125.23standardstandardstandard6.92semi-wideRelatively large inner rim diameter with large cup volume for a dark sound. Standard euphonium model with a large backbore. 51C425.23semi-flatstandardstandard6.92semi-wide Shallower cup than the 51. Plenty of volume and power. Solid tone throughout the instrument's range. 51D25.24standardstandardsemi-deep7.11standard An even deeper cup than the 51 for a heavy, rich tone. Specifically for euphonium. ...

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