This is a Miraphone TU28. I purchased it in September 2024. I tried it once and haven't used it since, so I'm selling it. It's an F-tuba mouthpiece with a large inner diameter and a shallow cup. I think it will allow for a smooth transition from a B♭/C tuba. I've lost the original box, so I will ship it in a Perantucci package. Inner rim diameter: 32.9mm Throat diameter: 8.2mm Cup: Shallow U-cup Universal shank