Use the progressive Geisha weighted Magnetic Kegel Balls system that can be used with or without the included silicone string to tone and strengthen your pelvic floor muscles.To begin training,?start with one black ball on the silicone string and then gradually increase the weight by magnetizing one ball at a time.?Geisha Magnetic Kegel Balls?gives you 7 different levels for your Kegel workout.?These geisha balls include 4 magnetic balls: (2) .55 oz. | .71d? (2) .95 oz. |?.87d?