... positive pressure (pressing in on body tissues), Massage Suction Cupping is a negative pressure, pulling body tissues out and ... eliminates some of the disadvantages. THE MANUFACTURING IS UNEQUALLEDThe Suction Cupping appliance is practically unbreakable, convenient, safe and suitable for ... size for face or the points with less muscle; feet, hands, forearms. Medium size for upper arms and lower legs, ...