Cloud 9 Premium Kegel Ball Training Kit creates a variety of erotic and sensual experiences with your partner or on your own. Perfect for kegel exercises to tighten and tone kegel muscles, or for play with couples. This sensual pelvic exercise kit includes four weighted balls for your personal pleasure. Each ball houses a smaller sphere that jiggles every time you move, enhancing internal stimulation. Made of premium, silky, soft silicone.