The Black “Hard" series is taking the original Deep Throat, updating them with a more gripping material that grabs you better, and actually tightens more as you use it. The "Deep Throat" onacup of the Tenga masturbation cup series lets you experience a deep sucking sensation…Special valves create a virtual vacuum inside the onacup, to deliver an amazing sucking sensation. And, the unique pinched-in shape of the cup helps to achieve an unparalleled tightness. These advanced features combine with an arousing "slurping" sound and vibration to give you the feeling that you’re enjoying a real deep throat experience.