Add a little fun to pelvic workouts with these luxurious color-changing Kegel balls. Wrapped in silken black silicone, not only do these jiggle balls contain free-roaming weights for discreet arousal, they also change color with the heat of your body. Tipping the scales at 3.1 oz and entirely encased in silken silicone, this set features two balls, which change color from black to purple as your body heats up. Free-roaming weights heighten sensation during wear. Regular use can strengthen Kegels to help intensify orgasms.Balls change color from black to purple as your body heats up. 3.1oz weight for intermediate to advanced users 2.5 inch retrieval looped cord for complete peace of mind during use. As you move, the internal weights jiggle about. As your muscles clench around them they provide a light internal workout, which can improve vaginal tightness and aid orgasmic strength. The jiggle balls come with a Fifty Shades of Grey storage bag, making them an ideal erotic gift for fans of the books. Part of the Fifty Shades of Grey Official Pleasure Collection approved by author E L James.