Any brass musical instrument will respond better and produce better tone when it is used with a mouthpiece that best fits the horn and the player. The list below consists of tuba (or sousaphone) mouthpiece specifications provided by manufacturer's literature. Different brands may measure slightly differently. The cup depth indication is subjective and is provided for convenience. The abbveviations are: S=shallow, MS=medium-shalloe, M=medium, MD=medium-deep, D=deep. One maker's M might be comparable to another maker's MD. The same subjectivity applies to the Rim Width indication. Entries in the Notes column are usually gleaned from the maker's marketing literature. (If you don't see a mouthpiece brand that should be included, or if you have corrections, please use our contact form to send a suggestion. It would help if you can provide the manufacturer's web site.)