- Signature Series - Inner cup diameter: 17.18 mm - 20 Backbore - Silver-plated - The 3-FL has been equipped with the same rim characteristics as the MOST 3 trumpet mouthpiece - Deep cup and MOST-FL signature backbore - The mouthpiece rim was specially designed for Osamu Takahashi and Toshio Tanaka EUR 215.00 - See more - Buy online