LOTUS Trumpet 9M Bronze Gen3; mouthpiece for trumpet; cup diameter: 16.0 mm, comparable to Bach 10. 5D, GR 62M, Reeves 40M and Warburton 7M; cup depth: medium; bore: 3.9 mm; material: bronze (warm and rich sound), LOTUS gold coating: hypoallergenic, scratch-resistant and does not tarnish; wide range and sound with support for the upper register; suitable for beginners, piccolo trumpet and musical theater.