Mouthpiece for F and E♭ Tubas For S shank, suitable for small bore tubas (compatible with YAMAHA, B&S, Miraphone, etc.) Purchased 3 years ago and used for about six months, so there are some signs of use and dirt. *** The PT-64 model produces a clear, core sound, creating vibrant, moving, and beautiful tones. It is versatile, and when combined with a CC tuba, it creates an extraordinary tone. Especially when combined with an F tuba or E♭ tuba, it produces a powerful, grand sound, making it effective for solo performances with ensembles or for playing high-range orchestral pieces.