Duration Tubes provide a visual cue for increasing controlled airflow. By lengthening the tube and switching from the fuzzy to the plastic ball you can make the exercise more difficult as your client gains proficiency.

The tubes can be extended to more than three times their initial length of 8". Multiple tubes can be connected, allowing for further extension.

Contents:

Blowing Duration Tubes (3)
Mouthpieces (3)
Balls (3 fuzzy, 3 plastic)
Instructions.