Features: 1.Pressure Reducing: This pressure reducing valve is designed as an auxiliary tool for playing horn, which can reduce the pressure on the mouth and improve the comfort and skill of playing. 2.Posture Correction: This horn mouth corrector can help performers correct incorrect postures in their mouth and face, improve the sound quality and technique of performance. 3.Comfortable Using: Ergonomic designed, this breath training corrector provides a comfortable user experience and reduces discomfort to the mouth and face during prolonged performance. 4.Reliable Material: This breath trainer is manufactured with premium brass material, ensures durability and reliability, could maintain stable performance over long periods of use. 5.Wide Application: This correction tool is suitable for various models of horn, with simple installation steps and easy adjustment, suitable for performers of various skill levels.specification:Item Type: Horn Pressure Reducing Valve Material: BrassPackageList:1 x Horn Pressure Reducing Valve1 x Storage Box