K&G Bass Trombone 000E; mouthpiece for bass trombone, rim inside diameter: Ø 29,00mm, cup depth: E (very very deep), medium wide rim, large shank, silver plated; Kurun & Gilbert mouthpieces are engineered mouthpieces; their design is based on years of knowledge and experience together with applied engineering principles ranging from fluid mechanics to acoustics; K&G Mouthpieces aim to offer the musician great intonation, slotting of notes, musical range, articulation, sound projection, vibration and ease of playing through its efficient design