Warburton backbore nr.: 8* for trumpet, medium large size. This Series produces a quality of sound acceptable in the orchestra as well as the concert band. Models #8 is very well received by the orchestra player who appreciates the increased volume of sound with less resistance. The STAR Series were designed to allow each of the STANDARD models to be more free blowing without the necessity of reaming to a larger bore size.
Truly useful backbore for tight blowing trumpets. I prefer the 8 for a big sound and the 6* for endurance playing. Everyone is different. New backbore marked Warburton USA actually has the best made shank threads I've ever seen, the cup screwed on perfectly (I am an engineer). For me, Quality 6 and a good price.
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