This is the NEW baritone version of our famous neck enhancer. It works exactly the same way. The effect is actually more pronounced on the bari! It really improves response and evens out the timbre. We’ve got a video on YouTube showing you how to use it. There’s a groove for the addition of an O ring (not included) if you are using an unusually large chambered mouthpiece. O rings are available at any hardware store.Fits almost any baritone sax and mouthpiece. DO NOT order if (1) your neck ID is less than .520″ or (2) your mouthpiece shank is less than .620″. It’s up to you to measure!