LOTUS Trumpet 2L Nickel Silver Gen3; mouthpiece for trumpet; cup diameter: 16.85 mm, comparable to Bach 1 1/4C, Schilke 16C, Warburton 3MD and Yamaha 16B4; cup depth: medium deep; bore: 3.7 mm; material: Nickel silver (brighter and more focused sound, clearer articulation), LOTUS gold plating: hypoallergenic, scratch-resistant and does not tarnish; full and warm sound; increased tonal stability; suitable for jazz, chamber playing and orchestral playing.