: 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 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 high quality zinc alloy, fine polish makes it slick and pretty with unique patterns.4. Suitable for replacement and repair of trumpet finger buttons5. Perfect replacement and easy to install. Specifications:Material: Zinc AlloyColor: Silver whiteSize: approx 16.5 x 10mm/0.65 x 0.39 inch(Dia x T)Thread Dia: approx 3.9mmWeight: 210 g Package include:45 x Trumpets Finger Buttons