Product Description:Advantages: 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 information2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed.3.Outer Diameter:23mm/0.9inch inner diameter: 18mm/0.7inch4. Fit for trumpet finger button replacement and repairing.5.Exquisite craftsmanhsip, convenient to use.6.A set includes 3 pcs Top Valve Caps,3pcs Bottom Valve Caps and 3pcs Finger Button.Specifications:Material: CopperColor: CopperOuter Diameter:23mm/0.9inch inner diameter: 18mm/0.7inchWeight: 760 gPackage include:15 x Top Valve Caps15 x Bottom Valve Caps15 x Finger Button