Same as the #16C4 except the shallower medium-small B cup offers more resistance providing a brighter quality of sound. The 16B4 is an excellent choice for Eb trumpet when a player requires a bigger rim diameter. Mouthpiece Information: Instrument: Trumpet Model: 16B4 Finish: Silver Plated Throat: 26 0.677 Inches These mouthpieces were a collaboration with trumpet artists and colleagues of Renold Schilke from 1950’s and early 1960’s.