Discover the Sensation of Aerostimulation! TENGA has improved upon their famous CUP Style with the new AIR-TECH Reusable Vacuum CUP – now with a removable sleeve for cleaning! Also featuring an all-new airflow structure for boosted Vacuum Suction Sensation! The STRONG is for those who enjoy encasing themselves in a tight, vigorous experience. Not only is the material firmer for a stronger stimulation, the ridges and ribs are all more pronounced for a dynamic sensation!