Air trainer popularly used by trumpeter Arturo Sandoval and Tom Hooten. The Astra device is used to help players stabilize and regulate their air stream, as well as learn to eliminate stress in their playing. It helps raise awareness of proper breathing and breath support. By the use of various weighted balls, the player can adjust their playing characteristics to become more efficient in the use of their air. Can be used with or without the addition of mouthpiece buzzing. See the video below by Tom Hooten for more information. Mouthpiece not included.