Mouthpiece (brass) Mouthpiece (brass) On brass instruments the mouthpiece is the part of the instrument placed on the player's lips. The mouthpiece is a simple circular opening that leads, via a semi-spherical or conical cavity, to the main body of the instrument. Mouthpieces vary to suit the tone of the instrument. Lower instruments also have larger mouthpieces, to maximize resonance (see pitch of brass instruments). Also, mouthpieces are selected to suit the embouchure of the player, to produce a certain timbre, or to optimize the instrument for certain playing styles. For example, trumpet and trombone mouthpieces are usually semi-spherical whereas French horn
Bit mouthpiece have a straight bar mouthpiece, but with the addition of a port, spoon, or other accoutrements, and thus are not truly classified as a mullen or straight bar mouthpiece." Types of Bits: All types, including driving bits. What it is: The middle of the mouthpiece has a "port," or curve, which may vary in size from "low" to "high." The port is different from the mullen mouth in that the curved portion does not extend the width of the mouthpiece, but is only an inch or two in the center of the bar. Action: Ported bits act on the lips,