LOTUS 2L2 mouthpiece for trumpet; inner diameter: 16.85mm (0.66"); inner diameter approx. comparable to: Bach 1-1/2 - 2, Monette B3/B4, Schilke 13, Yamaha 16, Warburton 4; bore: 3.9mm (between #23-24) "Symphonic" bore; bronze, silver plated; bronze mouthpieces are suitable for: smaller jazz ensembles, chamber playing, solo repertoire and whenever you want to fill the room with sound; cup: a C-cup equivalent optimized for Jazz & Commercial players willing to trade in a little bit of the warmth & width in their sound in exchange for maximum firepower in the upper register, and a more crisp, punchy playing experience all-around