Product Description Three ball spirometer The three balls spirometer is mainly used for normal breathing restored trainings for the patients who has just done splanchnocoele operation. Yingmed medical also supply other medical products like Surgical Instruments, Diagnostic Devices, Natural Cotton Roll, Medical Non-Woven Tape, Surgical Tubes, Wound dressing, Syringe, Pvc Anesthesia Mask. Welcome your inquiry. Material: Body PP, Ball PP, Tube PE. Mouth piece PP Capacity: 600ml, 900ml, 1200ml Packing: 1set /color box, 50sets/ctn Carton size: 74*37*35cm