Feature:1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information;2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed.3.Made of brass material,Silver Plated Horn Mouthpiece4.Bass Trombone Mouthpiece Musical Instrument Accessories5.The most precise mouthpieces are produced by computer-aided design system and computer controlled lathe workSpeifications:Color:SilverMaterial: BrassSurface: Silver platedBrand name: UnbrandedTaper: 1:20Size:81.4x39.1mm(HxDia),Inner Dia:25.7mm ,Socket Dia: 12.7mm, Edge Width :10.3mmWeight:900gPackage includes:5 x Trombone ...