This is a 5G (large bore) Back mouthpiece, a long-time favorite and a classic. It has excellent response across all registers and is characterized by a rich volume. This is a standard model that makes clear articulation easy and provides a comfortable playing experience. It's easy to play, making it a recommended mouthpiece for beginners. - Silver-plated large bore model. - Cup depth: D Deep - Diameter: 25.50mm - Rim: MW Medium Wide - Bore size: 7.00 mm