PNP INC 12-Piece Rotary Cupping Set This 12-Piece Rotary Cupping Set is a unique way to relieve sore and aching muscles. The cupping method stems from traditional Chinese medicine, simply place one or more cups directly onto the skin and turn the dial clockwise to create suction. Measurements: Set includes TWO cups of each of the following inside diameters: 1.25, 1.5, 1.75, 2, 2.25, and 2.5 inches. Material: Cups are ABS plastic. Color: Cups are clear. Note: Read instructions before use.