This Portex Incentive Spirometer is used to help wind and brass players improve their breathing by helping them work towards achieving goals. This device features at its heart a plastic marble in a tube. The user's goal is to use their breath to raise the marble to the top of the tube on each inhalation. The unit can be flipped over and used for exhalation as well. A valve allows to user to change the resistance and increase the challenge of hitting the top of the tube. The unit can also be used in conjunction with instrument mouthpiece practice (best fits low brass instruments). Includes the unit, a flexible tube and removable plastic mouthpiece.