The Jupiter Mouthpiece is our most popular trombone/baritone mouthpiece and Jupiter is now manufacturing this mouthpiece at the best possible price. A high quality product and also affordable. Nothing more to ask!
The 6 1/2 AL mouthpiece is the most popular trombone/baritone mouthpiece size. The number refers to the mouthpiece cup, bowl and rim.
The "Small Shank" is the standard size. Large instruments such as bass trombones and the larger size euphoniums use the "Large Shank". If you are not sure what you need, ask your director.