MP for Bass Trombone Willie's Emperador Grande This is a mouthpiece for bass trombone that uses the body of the Emperador series, which is highly regarded as Willie's tenor jazz model. The rim has excellent grip, and the cup is surprisingly shallow for a bass trombone, I couldn't help but laugh when I first played it. However, perhaps due to the rim diameter and throat, it can still produce a solid bass trombone sound. Specifications: Rim diameter 28.5, cup equivalent to Bach C (A < C < G, standard for bass is G), bore 7.5-7.0 (double bore) straight shape Retail price... ¥33,000 (at the time, I don't know the current price) Thank you.