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. Specifications:Material:Copper+Metal+PlasticColor:MulticolorWeight:17gSize:Trumpet Valve Spring:46x8.8mm/1.8x0.35(L x Dia)Trumpet White Felt Washer:15x5mm/0.59x0.19inch(OD x ID)Trumpet Black Felt Washer: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)Trumpet Finger Buttons: approx 16.5 x 10mm/0.65 x 0.39 inch(Dia x T)Trumpet Finger Buttons Thread Dia: approx 3.9mm/0.15inch Package include:3 x Trumpet Valve Spring3 x Trumpet White Felt Washer3 x Trumpet Black Felt Washer3 x Trumpet Valve Guide2 x Trumpet Valve Cork Pad2 x Trumpet Tuning Slide O Ring3 x Trumpet Finger Buttons