Mouthpiece (brass)

The mouthpiece on brass instruments is the part of the instrument placed on the player's lips. The mouthpiece is a circular opening enclosed by a rim and leads to the instrument via a semi-spherical or conical cavity called the cup. From the cup, a smaller opening leads into a tapered cylindrical passage called the backbore.

The backbore is housed in a tapered shank, which is inserted into an opening called the receiver on the main body of the instrument.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY 3.0

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