Hammond Design 4MB
4MB Trumpet Mouthpiece Equivalent rim to Bach 1 1/2/Schilke 14/15. This is similar in depth to the MV, but in a bowl-shape. This helps to create a very versatile cup for all-around playability. The MB is the choice of the player needing more support, but the ML cup is too open. Features a 26 throat and a #3 backbore.