YAMAHA BB-66D4 Tuba Mouthpiece Reference Price: ¥11,000 Features: A tuba mouthpiece from YAMAHA. This is a standard series made of brass. This model is for Eb tubas. This is the standard series before the model change to BB-Neo67D4. It is used in wind orchestras and marching bands. Although there are some scratches and small dents, it is still a usable item. Specifications: ■ Mouthpiece ■ For Tuba ■ 66D4 ■ Inner Rim Diameter: 31.49 ■ Throat Diameter: 8.87