Sportsheets Sex and Mischief Collection Steele Balls are simple to use. A lady inserts the balls and can become turned on because they move while she moves or walks around. Also builds muscle strength.The balls are weighted allowing you to have to contract parts of your muscles to carry them in. This is not merely useful with strengthening vaginal muscles but additionally helps strengthen urinary control. Use with sexual intercourse or when you are performing your Kegel workout. Although these Ben Wa balls are listed as vibrating they don't vibrate inside a traditional way but through kinetic energy. 100% Stainless Steele Balls: Steel Balls, felt bag