Thank you for viewing! Trombone Large Shank Mouthpiece Brass Lab Momo 51S Throat 6.8 (Usually throat 7.0) Inner Gold To experiment with how much the performance changes depending on the throat size, I purchased several new mouthpieces with different throat sizes, varying by 0.1mm, about three years ago. The experiment is now complete, and I no longer use them, so I am selling them! This is a versatile type that retains the quality of Brass Lab while also being suitable for those with a more delicate breath. ※※※ Currently, a new Inner Gold mouthpiece costs nearly 60,000 yen, making it quite expensive (＠_＠;) If you want to experience the true essence of Brass Lab, please give it a try! Product Information With the concept of developing all the conditions to maximize musical expression when brass instrument players perform, we have conducted many years of research with performers. As a result, we have delved into the hardness and metal crystal grains of the metal material at a micro level and succeeded in controlling it to the best metal state for performance. It is gentle to everyone and brings out the greatest musical expression with minimal effort, so please pick it up and try it. You will feel a playing sensation you have never experienced before. I have used it several times in performances, so there are some marks on the shank, but they are not noticeable once attached to the instrument. Otherwise, it is in beautiful condition with no scratches.