Tenga Gentle Premium Original Vacuum Cup features it's celebrated hourglass shape and valve-structure that provide constriction and amazing suction with all new internal details upgraded from 15 years of engineering advancement. Special valves create a virtual vacuum inside the cup to deliver an amazing sucking sensation. Also, the unique pinched-in shape helps to achieve an unparalleled tightness. These advantages features combine with an arousing slurping sound and vibration to give you the feeling that you're enjoying a real deep throat experience.