LOTUS Trumpet 1M2 Nickel Silver Gen3; mouthpiece for trumpet; cup diameter: 17.12 mm, comparable to Schilke 17B3A, Yamaha 16D4A; cup depth: medium shallow; bore: 3.6 mm; material: Nickel silver (brighter and more focused sound, clearer articulation), LOTUS gold plating: hypoallergenic, scratch-resistant and does not tarnish; bright and full sound; clear response; good note targeting; suitable for classical, jazz, lead playing and big band.