GR 66 Series Trumpet Mouthpiece


Approximately equivalent to a Bach 3 rim diameter

The 66M is a very popular choice for 3C players looking for more core in their sound with more secure articulations. The 66Z Series and 66SZ are popular alternatives for players who “bottom out” or get a thin sound and poor articulations on a conventional 14A4a or similar models. The 66Q series feature the Q rim which is slightly flat; outside diameter follows tradition in width and contour, highpoint is further out than the Standard GR rim; the bite is medium sharp with the traditional feel and grip, and the alpha is medium for lip freedom, support, and articulation. The bite grip holds the lips from penetrating too far into the cup.



Extensive versatility in design has GRs being used by serious students and educators to the world’s finest Symphony Orchestra trumpeters and the top studio musicians in Los Angeles.

With hundreds of standard models and thousands of custom designs, GR has a mouthpiece to match you, your horn, and your musical needs.

The GR No-Discontinuity design allows for a perfect blend of rim to cup, throat, and backbore for optimum performance. Crisp articulations, a rich vibrant centered sound, outstanding intonation, easier upper register, and a fatter lower register are some of the benefits of this design.

GR cups are not measured by depth. Rather, GR calculates cup volumes and believe this to be a more accurate way to define mouthpiece function and measurement.

The numerical designation of each GR mouthpiece series numbered 62-67 is equal to its rim diameter in hundreds of an inch: the 63 series, for example, have a rim width of .63″.

Additional information

Weight N/A
Dimensions N/A
Choose Size

66C, 66C*, 66C**, 66ES, 66M, 66MS, 66MX, 66S, 66SB, 66SZ, 66Z*, 66Z**

Choose Finish

Gold – Custom, Made to Order, Silver


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