Features: 3.Suitable for three-note B-flat trumpet/cornet/B-flat palm trumpet.4.High-quality materials, high-quality and , not easily damaged, guaranteed to be used for a long time, a necessary replacement accessory for small sizes.5.Helps improve key accuracy and playing fluency.6.Exquisite craftsmanship, complete varieties, simple and convenient, suitable for the replacement and improvement of musical instruments, suitable for daily maintenance of wind instruments, easy and fast to use, without too many complicated operating steps.Specifications:Material: Copper & Metal & PlasticColor: MulticolorBrand name: BQLZRSize:Trumpet Valve Spring: 46x8.8mm/1.8inchx0.35inch (LxDia)Trumpet White Felt Gasket: 15x5mm/0.59inchx0.19inch (ODxID)Trumpet Black Felt Gasket: 18x9mm/0.7inchx0.35inch (ODxID)Trumpet Valve Guide: 18x11x4.5mm/0.7inchx0.4inchx0.17inch (LxWxID)Trumpet Valve Cork Pad: 3x8.9mm/0.11inchx0.35inch (HxDia)Trumpet Tuning Slide O Ring: 12x10mm/0.47inchx0.39inch (ODxID)Trumpet Finger Buttons: 16.5x10mm/0.65inchx0.39inch (DiaxT)Trumpet Finger Buttons Thread Dia: 3.9mm/0.15inchWeight: 21 gPackage include:3 x Trumpet Valve Spring3 x Trumpet White Felt Gasket3 x Trumpet Black Felt Gasket3 x Trumpet Valve Guide2 x Trumpet Valve Cork Pad2 x Trumpet Tuning Slide O Ring3 x Trumpet Finger Buttons