With its trumpet mouthpiece Bach L551 Trumpet 5MV of the Commercial series, Bach delivers a grandiose tool for lead trumpeters. The Commercial Series impresses with a bright, wide sound. The mouthpiece projects the tone far forward. Due to the v-shaped, flat bowl, the response in the high position is particularly easy. The lips do not tire prematurely due to this special shape of the bowl. The internal diameter of the Bach L551 Trumpet 5MV Commercial Series mouthpiece is 16.54 mm. The bore is 3.66 mm. The weight of the Bach Commercial mouthpiece lies between the normal and Megatone mouthpieces.