Custom Duplications or Designs for Modular Trumpet and Cornet BackboresIn our files, we have many specifications for backbores we have made or duplicated. We keep these records so we can make a new mouthpiece in case of loss or damage or if the customer wants another copy with variations. You can also work with us to design your own, if you wish, and we will follow your specifications to the letter. Please Note: Payment in advance is required and no returns or exchanges are allowed on custom mouthpieces. During your