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The Gr Technologies Standard 3 Backbores
#1 - This backbore produces a focused core of sound and outstanding intonation and projection. Ideal for lead trumpet work and commercial settings.
#2 - This backbore features a fat sound with some edge and medium blow resistance. An ideal backbore for all around playing.
#3 - Low blow resistance with a clear centered, yet full sound. Ideal for everything from jazz to symphonic work.