Item Type: French Horn Pressure Reducing Valve Material: Brass Package List 1 x French Horn Pressure Reducing Valve 1 x Storage Box 1Pressure Adjustment: This product is designed as an auxiliary tool for the French horn, which can improve the comfort and skill of playing by reducing the pressure on the mouth. 2Reliable for Use: This product is made of premium brass material, with durability and reliability, and can maintain stable performance over long periods of use. 3Better Training: This product can help performers correct posture of their mouth and lips, thereby improving the sound quality and skills of performance. 4Comfort Blowing: Designed to conform to the ergonomics, providing a comfortable user experience and reducing discomfort to the mouth and face during prolonged performance. 5Easy to Install: This product has simple installation steps and is suitable for various French horn models. It is easy to use and adjust and suitable for performers of various skill levels.