A great trombone mouthpiece very popular mouthpiece for beginners or first trombone (higher voices) new and OVP series 350 narrow shaft Kessel diameter: 24.50 mm boiler depth: medium hole: .230 "/5.85mm back bore: 402 Silvering Dear mouthpiece interested: Not every mouthpiece fits every trombone . Before buying, please find out whether the mouthpiece offered fits your trombone . If in doubt, please contact me. Thank you !!! If you already have a mouthpiece that fits your trombone : Please measure the outside diameter at the bottom of the shaft. A mouthpiece with a small shaft has approx. 10.8mm Ø. A mouthpiece with a large shaft has approx. 12.7mm Ø. If you have any questions, please write me a message or register. If you already have a mouthpiece that fits your trombone : Please measure.
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