The practice device for blowing lips and vibrating mouth during horn playing has and comfortable . The inner wall has undergone multiple polishing processes, making it smooth and tidy. The surfaces silver plating is not only for the sake of beauty, but also the molecular structure characteristics of silver will improve the overall timbre. brass specifically for wind instrument, ensuring a clear and full tone and good resonance. Hollowing processing, smooth surfaces, used for daily practice of trumpet players, mastering the mouth shape of blowing. Can be used as a for trumpet beginner, professional performers, and adults.