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. Helps achieve optimum lung capacity and restoring disrupted breathing patterns. 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. Bite mouth is made of safe and comfortable materials, ergonomically designed, high- quality and durable lung breathing trainer. Innovative design, can be dis-assembled into parts for cleaning and disinfection.