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 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.Perfect Suitable for daily maintenance and repair of B-flat trumpet,cornet and B-flat palm.4.This is a great upgrade alternative for your trumpet and made of high quality which is sturdy and durable to use.5.The felt washer is soft and smooth, it will not scratch the trumpet.6.Help to improve the accuracy of the keys and improve the fluency of playing. Specifications:Material:Copper,Metal,Plastic,Zinc AlloyColor:MulticolorSize:Spring:46x8.8MM/1.8x0.35(L x Dia)White Felt:15x5MM/0.59x0.19inch(OD x ID)Black Felt:18x9MM/0.7x0.35inch(OD x ID)Trumpet Valve Guide:18x11x4.5MM/0.7x0.4x0.17inch(L x W x Inner Dia)Trumpet Valve Cork Pad:3x8.9MM/0.11x0.35inch(H x Dia)Trumpet Tuning Slide O Ring:12x10MM/0.47x0.39inch(OD x ID)Finger Button: 16.5 x 10mm/0.65 x 0.39 inch(Dia x T)Finger Button Thread Dia: approx 3.9mmWeight:18g Package include:3 x Trumpets Finger Buttons3 x Spring 3 x White Felt 3 x Black Felt 3 x Trumpet Valve Guide 2 x Trumpet Valve Cork Pad 2 x Trumpet Tuning Slide O Ring