Features: 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.Product use: suitable for trumpet, trombone, cornet, baritone and other instruments 4.High-quality material: Our small cork mats are made of high-quality cork material. 5.Sturdy and , stable working performance and long service life. 6.Size: 9.5 x 4 mm / 0.37" x 0.16" (W x T) Will fit many other models. 7.Trumpet corks are used for repairing trumpets and trombones, but can also be trimmed to fit other models such as: cornets, palms, altos, etc. Specifications: Material: Cork Color: Wood color Brand name: Yibuy Size: 9.5 x 4 mm / 0.37" x 0.16" (W x T) Weight: 20 g Package include: 100 x Trumpet Drain Valve Cork Pad 0.37"x0.16"