Feature:1. The overall use of copper material to build, the surface of silver plating process, enhance the ability to resist erosion.2. Carries out excellent polishing, so that the surface of the object is bright and the overall appearance is beautiful.3. Pull down to fix the mouth shape, increase the endurance of the mouth muscles, exercise the lip biting force and the concentration of the lip muscles.4. The rubber ring is removable and detachable. Increase the friction of the mouth strength exerciser to prevent it from falling off when held by the hand due to the smooth surface.5. The force at the time of gripping and normal training is the opposite (reaction force). Each 20 seconds can relieve the necrosis of the mouth muscles caused by too much practice, and exercise the endurance of the lip muscles.Specification:Item Type: Embouchure TrainerMaterial: Copper and silver plating.Package List:1 x Embouchure Trainer