Yamaha mouthpieces are produced using the most advanced computer design and manufacturing technology, giving them unmatched precision and consistency. The 6A4a trumpet mouthpiece has a very shallow cup that gives extra support for high notes. Good choice for big-band style lead trumpet work. The 6A4a trumpet mouthpiece has a very shallow cup that gives extra support for high notes. Good choice for big-band style lead trumpet work. 15.90mm inner diameter, shallow cup Thick and semi-flat rim, narrow backbore Extra thick silver plating for added durability and longevity. Fits all brands and models of standard trumpets. UPC 086792534619 Color Silver Style Modern Brand Name Yamaha Model Name YAC TR6A4A Finish Type Polished Item Weight 0.25 Pounds Manufacturer Yamaha Model Number YAC TR6A4A Material Type Brass Instrument Key B Flat Item Type Name Trumpet Mouthpiece Item Dimensions 4 x 1.25 x 1.25 inches Included Components Mouthpiece Warranty Description 1 year manufacturer warranty yamaha corporation of america (yamaha) is proud of the experience and craftsmanship that goes into every product we represent. Yamaha sells its products through a network of authorized yamaha retailers. Only these authorized retailers are equipped with sales and service support materials and training that are not readily available to non-authorized retailers. The yamaha limited warranty applies only to products that have been purchased from an authorized yamaha retailer in the fifty united states (including the district of columbia) and used in this area. For more information, please review the yamaha limited warranty for this product on our website. Manufacturer Part Number YAC TR6A4A Global Trade Identification Number 00086792534619