Trumpet mouthpiece trainer, according to the mouthpiece and breath forward,lips concentrated,shut the wind principle, avoid the outer lips mouth pull exercises gums, teeth, close,teeth are aligned parallel to the lips,mouth,while the correction strength exercises and mouth breath.At the same time exercise fresh mouth, lips fixed. Two are used, a pull, exercise lip biting lip muscle force and concentrate.Gripping a pencil like,each gripper 10-20 seconds.Muscle endurance exercise lips. Trombone, French horn, saxophone mouth strength exercises apply. colour: Silver Material: stainless steel Package Contents: 6 x Trumpet mouth strength trainer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.