Made of aluminium, sturdy and durable for long term use. Suitable for brass and woodwind trumpet trombone French horn tuba flute clarinet bassoon. Use both ends and pull one end to build lip biting power and lip muscle strength concentration. One is like holding a pencil for 10-20 seconds at a time. Exercises lip muscle endurance. You can make great improvements with this moderate exercise. But 't practice too much before you officially play the trumpet, it will tire you out. Suitable for trumpet trombone cornet clarinet saxophone horn. size: 6.5 x 2 x 1cm Material: aluminium colour: silver Package Contents: 1 x 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.