Unique design, the first of its kind in the market. Simple to use vacuum cup for all purposes in cupping therapy and T.E.N.S. stimulation.Features Safe and effective Easy to learn and operate; no fire or hand pump Hydro pad free. Hydro pad is not required for electro-conductivity Firmly sits on skin Strong suction force and adjustable Can be applied to most areas of the body, such as joints, curvatures and uneven surfaces Sterilized with boiling water Connects easily to pin lead wire Easy to carry and storage, suitable for travel or home use. Diameter: 6cm (cup opening)Qty: 2 cupsAvailable in smaller size: Cup n Stim 4.5cm Specifications: Name Cup n Stim 6cm