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Re: 7C or 5C trumpet mouthiece
5B, then when they are more mature and not having range problems you can consider moving to a larger rim size. The B cup will help them produce more resonance.
I start beginners in 5th grade. Would it be better to start trumpet players on a 7C or a 5C. I would like for them to play on a 3C in high school if possible.