B. TILZ M-8 tuba mouthpiece from the German mouthpiece specialist B. TILZ. - Model: B. TILZ M-8 - Silver plated Thank you for viewing. It's an old item, so it has some wear and tear, but there are no dents in the shank. This is a B♭ tuba mouthpiece, but it's often used for F tubas in Japan. It feels a bit shallow for playing a B♭ tuba.