Possibly (okay, definitely!) inspired by a very memorable scene in the Fifty Shades of Grey legacy, the sexily weighty, silicone-cradled Inner Goddess Glass Pleasure Balls hail from the official Fifty Shades collection, and they're ready to deliver deep, stimulating sensation while naturally strengthening key pelvic floor muscles. Kegel or ben-wa balls have been around for a very long time (Japanese courtesans are thought to have used them in the 1600's, for instance), but today, kegel exercise is a well known practice in gynecological/obstetric circles. Kegels- the act of consciously and repeatedly flexing the pelvic floor muscles- can help tighten up the pelvic floor. A tighter pelvic floor leads to improved inner snugness, better control of continence after childbirth or surgery, the possibility of stronger, more intense orgasms and an overall happier vagina. Put simply, the Inner Goddess Glass Pleasure Balls provide a great-feeling object for the pelvic muscles to grip during kegels- you'll have to flex to hold them in place. You can wear them anytime, anywhere for a discreet workout. Fair warning though, they feel really good, so you may have a hard time concentrating on any non-kegel tasks at hand!Identical in shape, 2 glass balls will come already inside a silky black silicone cradle complete with long retrieval cord. You can keep them in the cradle for a combined weight of about 2.7oz/77g, or, you can pop them out and wear one or both balls without the cradle.In high quality body safe silicone and quality pyrex glass, the Inner Goddess Glass Pleasure Balls clean easily using warm soapy water, but you you can also use a good toy care fluid/foam. Compatible with any favorite water based lube, but please avoid contact with silicone lubes and other silicone toys.*Balls measure about 6.5" (16.5cm) in total length. Approximately 3" (7.6cm) are insertable. Each ball is about 1.25" (3.2cm) in diameter.