The piston air-sucking cup is made out of transparent plastic with a piston inside. The suction is created by moving the piston upwards to draw air into the cup. This type of cup is convenient as well as providing strong suction. It is also difficult to break or damage it. Piston Air Sucking Cups are specialized suction devices that use a piston mechanism to create and maintain a vacuum seal. These cups are commonly used in therapeutic applications such as cupping therapy.