Marcinkiewicz standard trombone mouthpieces are arranged in a logical ascending order from deep to shallow and wide to narrow (No.0 to No.15). This arrangement permits players to select mouthpieces by precise increments of depth to find the correct cup volume required by their situation. For example, if a No.7 trumpet mouthpiece is too deep and a No.10 too shallow, a No.8 or No.9 may be the best logical choice. This is not true for other manufacturers - with Marcinkiewicz Co. Inc. you do have a