This weighted Kegel exerciser is great for strengthening the pelvic floor muscles. Made of seamless Lucite, with increasing weights for ongoing exercises. Use with a water, oil, or silicone based lubricant if you wish. Use it to Strengthen the pelvic floor muscles after childbirth or pelvic surgery or any time Work your way from beginner to advanced, starting with the smallest ball supported by your hand up to holding the heaviest weight in with no support