GR 64.7 Series Trumpet Mouthpiece


Approximately equivalent to a Schilke 13 rim diameter

Originally a custom job for Johnny Trudell—lead trumpeter and manager of the Motown Brass Section, who has recorded and performed with with Marvin Gaye, Stevie Wonder, Diana Ross, The Temptations, Four Tops, Smokey Robinson, Tommy Dorsey, Quincy Jones, Dizzy Gillespie, Jon Faddis, Donald Byrd, Bob Hope, Wayne Newton, Sammy Davis Jr., and Paul Anka, just to name a few—these mouthpieces quickly became so popular that GR decided to add them to the line.

The rim is slightly wider than the Standard GR rim, and features a semi-flat contour. It has a slightly more cushioned feel than Standard but with a bite that allows for precise articulations.



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

64.7M, 64.7MS, 64.7S

Choose Finish

Gold – Custom, Made to Order, Silver


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