Geisha balls Magnetic new and modern era of Kegel muscle exercise. Geisha balls Magnetic are simple and clear to use. The package contains 4 balls of different weight. The set consists of two pink balls 0.95 ounce and two black balls 0.55 ounce. The core idea of the exercise is to start with one black ball on a silicone string and then gradually increase the weight by magnetizing 1 ball at a time. It is the same you do during your workout at the gym. Geisha Balls Magnetic allows to do 7 levels of workout 0.55 ounce to 3 ounces. After this experienced users will work out only with the balls without a string. Materials: 100% Medical grade silicone. Weight of 4 magnetized balls: two balls 0.95 ounce. Two balls 0.55 ounce. Size 0.87 inch and 0.71 inch in diameter. The balls have 1 year warranty.