K&G The Masters Range Edition 5D+ mouthpiece for euphonium, rim inside diameter: Ø 25,75mm, cup depth: D (deep), medium wide rim, large shank silver plated, the new range of the Trombone Masters edition mouthpieces is developed to achieve more precise details, it features the same rim profile, cup and bore with a newly designed backbore that produces maximum accuracy, the standard is wider in sound quality while the Master range is less wide with more definition in all registers