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Its hourglass shape provides a sublime tightness. Special valves create a virtual vacuum inside the onacup to deliver an amazing sucking sensation. These advanced features combined with an arousing “slurping” sound and vibration give you the feeling that you’re enjoying a real deep throat experience. the five items that create the basis of Tenga each has its own unique asset such as "vacuums" and "adherence", we recommend you start with the Standard Series to get an idea of what's it all about.