GR Compu-Bal trumpet mouthpiece 63 rim BR_CLEAN Thick cotton padding also absorbs

Thick cotton padding also absorbs persperation and relieves weight

Indestructible - made from tough Delrin plastic - great for students

The specially designed Optimal Pressure System fits right into your trumpet and works with your normal mouthpiece top to teach you to use less pressure while actually playing

Designed and measured to fit one euphonium (bell up and forward)

Feature the GR Classic Blank

GR Compu-Bal trumpet mouthpiece 63 rim BR_CLEAN Thick cotton padding also absorbsQuick Comparison The GR 63 Series cup diameter is somewhat similar to a conventional 10 diameter. Classic Blank is standard. Studio, Symphonic, and FatBoy are available as a special order on some models.