Geisha Magnetic Balls are easy to use. The package includes 4 balls of varying weights: two pink balls at 27 g / 0.95 oz and two black balls at 15 g / 0.55 oz. The main concept is to start with one black ball on a silicone string and gradually increase the weight by adding one ball at a time, similar to gym workouts. Geisha Magnetic Balls offer 7 workout levels, ranging from 15 g / 0.55 oz to 84 g / 3 oz. Experienced users can work out with the balls alone, without the string. Designed to align with human anatomy, Geisha Balls are safe, made from 100% soft medical silicone, and come with a 1-year warranty.