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1. The pipeline is resistant to bending, will not be affected by the patient's posture, easy to clean and durable. 2. Can effectively prevent cross infection, keep the ball clean and hygienic. 3. The trainer is used for inhalation (breathing) exercises and tests, which is beneficial to increase lung ventilation. 4. Bright color balls, integrated into color psychology, stimulate patient training. 5. Convenient dual card connector design, tight connection, not easy to fall off. specification: Condition: 100% brand new Project Type: Breath Training Material: PVC packing list: 1 breath training