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".

62 Series GR Trumpet Mouthpieces
approximately equivalent to a Bach 10½ rim diameter

63 Series GR Trumpet Mouthpieces
between a Bach 10½ and 7 rim diameter

64 Series GR Trumpet Mouthpieces
approximately equivalent to a Bach 7 rim diameter

64.7 Series GR Trumpet Mouthpieces
approximately equivalent to a Schilke 13 rim diameter

65 Series GR Trumpet Mouthpieces
approximately equivalent to a Bach 5 rim diameter

65.6 Series GR Trumpet Mouthpieces
approximately equivalent to a Bach 5 rim diameter

66 Series GR Trumpet Mouthpieces
approximately equivalent to a Bach 3 rim diameter

3 Series GR Trumpet Mouthpieces
approximately equivalent to a Bach 3 rim diameter

66.5 and 66.6 Series GR Trumpet Mouthpieces
slightly wider than a Bach 3 rim diameter

66.8 and 66.9 Series GR Trumpet Mouthpieces
approximately equivalent to a Bach 1½ rim diameter

67 Series GR Trumpet Mouthpieces
between a Bach 1½ and 1¼ rim diameter

67.9 Zony Series GR Trumpet Mouthpieces
between a current Bach 1 and the larger, old Bach 1