Backbores come in many different shapes – they are not usually a consistent taper. However, they can be generally categorized as narrow, medium, or wide.
Backbores can only be considered in conjunction with the bore (i.e. a small bore can be balanced out by a wide backbore). Average together the width of the bore with the width of the backbore to estimate how the mouthpiece will sound.
Generally, a wider backbore means a more free-blowing, but less focused sound.
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