Garibaldi GR21 Sousaphone Silver Plated Finish Mouthpiece Size GR21 The Garibaldi Silver Plated Single-Cup Sousaphone Mouthpiece is the perfect choice for any Sousaphone player looking to improve their sound. Crafted with precision and attention to detail, this mouthpiece features a unique Single-Cup design that provides enhanced projection, articulation, and tone. Whether you're a professional or a student just starting out, the Garibaldi Silver Plated Single-Cup Sousaphone Mouthpiece is sure to enhance your playing experience. With its exceptional sound quality and playability, this mouthpiece is an excellent investment that will provide years of reliable and consistent performance. Details: CUP SIZE: GAR-GR21, EXT RIM SIZE: 53.85mm, INT RIM SIZE: 32.22mm, THROAT: 7.92mm, CUP DEPTH: Medium deep