Details
Color may vary of the balls and Breathing Pipe - Deep Breathing Lung Exerciser / Respirometer / Spirometer for comprehensive respiratory fitness - 3 chambers for differing inhalation rates from 600cc/sec to 1200 cc/ sec.
High Quality Break-Resistant Plastic, 3-Ball Incentive Spirometer, Convenient connector design, tight connection is not easy to fall off, compact size, Easy to carry.