Compact, high quality break-resistant plastic, 3-ball inhaling breath measurement systemSolid, non-shaky Construction; Removal bottom for thorough cleaning and hygiene maintenanceDeep Breathing Exerciser for comprehensive respiratory fitness - 3 chambers for differing inhalation rates from 600cc/sec to 1200 cc/ secHelps achieve optimum lung capacity and restoring disrupted breathing patternsComplete Instructions Provided; Ball Colors may varyAbout Shipping: All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances.Any questions, please feel free to contact usDuring the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours, wish you a happy shoppingThanks for your cooperation and we'll make you feel satisfied.