What quality control checks do you perform on a mouthpiece?

We adopted a standard quality control plan which controls both the process of making the mouthpiece and the product itself. For each and every mouthpiece, we measure the most critical dimensions to make sure that they are within established tolerances. We weigh each mouthpiece to verify that there is no variation in the mass. We visually inspect the mouthpiece throughout the whole process in order to maintain quality to the highest possible standards.