C Trumpet BackboresAfter careful testing and design, we've found the optimal backbore length and dimensions to suit the tendencies of the C Trumpet. They are available in the following sizes and styles: 7, 8, 9 Medium large sizes. The #7 provides a good balance of sound quality acceptable in the orchestra. Models #8 and #9 are very well received by the orchestra player who appreciates the increased volume of sound with less resistance. 10, 11, 12 Very large "Symphonic"
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