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100% Waterproof Medical Grade Silicone Ben Wa Ball is a new generation of Kegel Training device designed with comfort in mind. Add a little lubricant to the Kegel ball. Open your legs, push the ball slowly inside. After that, you can do some exercise, such as walking, swimming, working at home, the metal ball will crack with the internal surface while you move. You can start with a single ball first and after practice, carry on with other set of balls.