Enjoy suction play, increase sensitivity, and enlarge your breasts! This breast pump kit, in fun pink, is quick to assemble and easy to use. Simply place the pump cups over your breasts, squeeze the bulb, and pump your breasts to the desired level. Just press the release valve button when you are ready to break the suction. Measurements: Pump cups have 4.1 inch inner diameter, 3.5 inches deep.