The Tighten and Tense Silicone Jiggle Balls are made for women and can be used to strengthen kegel muscles. They are suitable for beginners and intermediates alike and are inserted into the vagina, where the muscles will naturally tighten to hold them in place. Inside the balls, themselves are smaller balls and weights that jiggle and roam, and so encourage the development of the muscles.
Although not explicitly designed for climax, many women find using balls like these incredibly pleasurable, as the internal weights shift around during activity. Use of Jiggle Balls such as these can lead to a tighter vagina, better sexual experience for you and your partner, and greater bladder control. The strong retrieval cord and soft silicone design make these an excellent item from Fifty Shades of Grey.