Vincent Bach 5G Vincent Bach Euphonium/Trombone Mouthpiece The 5G (large shank) by Bach is a long-time favorite and a classic. It is known for its good response across all registers and its rich volume. This is a standard model that makes clear articulation easy and provides a comfortable feel when playing. It is easy to play, making it a recommended mouthpiece for beginners. - Silver-plated large shank model. - Cup depth: D Deep - Diameter: 25.50mm - Rim: MW Medium Wide - Bore size: 7.00 mm