FixtureDisplays 12 Cups Healthy Medical Vacuum Cupping Suction Therapy Massage Device Set. This 12-piece Healthy Cupping Set is a unique way to relieve sore and aching muscles. The cupping method stems from traditional Chinese medicine, but its effects can be enjoyed in a variety of ways. Simply place one or more cups directly onto the skin, attach the tubing to the top opening of the cup and to the hand-held pump, and then pull the pump trigger to create suction. The tubing may be detached and the cups will still remain attached to the skin by the vacuum. Acu-Points centered within the cups provide additional stimulation against the skin. Measurements: The set includes two cups of each of the following inside diameters: 0.9, 1.37, 1.89, 2, 2.36, and 2.67 inches. Material: Cups are AS medical plastic. Color: Cups are clear. Please Note: Read instructions before use.