GR Mouthpieces are being played by the world's top call brass musicians, plus GR is the mouthpiece of choice for the finest performers, educators, and students. The GR 63 Series can be described as being between a Bach 7 cup diameter and a Bach 10 1/2. With various rim contours, alpha angles, cup volumes, and backbores, the GR 63 Series has many options for players who use this popular size. The GR 64 Series can be compared to a Bach 7 cup diameter.With various rim contours, alpha angles, cup volumes, and backbores, the GR 64 Series has many options for players who use this popular size. The GR 65 Series cup diameter is similar to a conventional 5 diameter. Classic Blank is standard. Symphonic Blank is standard on the C** and C models.
