Airlife Volumetric Incentive Spirometer without Valve, 4000 mL. Sturdy plastic, compact for convenient use/storage. Adjustable goal indicator provides guideline for adequate lung exercise. Dual-sided calibrations allow clear, legible identification of volumes. Inspiratory indicator encourages patients to maintain an appropriate rate of inspiration. The flexible tubing lets the patient adjust the mouthpiece for use in various positions, and a mouthpiece holder provides storage when not in use. Packaging: 12/Case.