LOTUS Trumpet 1L Nickel Silver Gen3; mouthpiece for trumpet; cup diameter: 17.12 mm, comparable to Bach 1 1/4C, GR 67. 4, 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 coating: hypoallergenic, scratch-resistant and does not tarnish; clear response; good note accuracy; suitable for big band, lead playing and orchestral playing.