Geisha Magnetic Balls are easy to use and come in a set of four with varying weights. This includes two pink balls weighing 27 g (0.95 oz) and two black balls at 15 g (0.55 oz). The exercise begins with one black ball on a silicone string, gradually increasing the weight by adding one ball at a time, similar to gym workouts. The Geisha Magnetic Balls offer seven workout levels, ranging from 15 g (0.55 oz) to 84 g (3 oz). Experienced users can train without the string. Designed with human anatomy in mind, these balls are made from 100% soft medical silicone and come with a one-year warranty. For usage, it is recommended to use the balls for at least 15-30 minutes daily. They can train muscles even during regular activities, as the body naturally holds them in place. Start with lighter weights and increase gradually. To remove, relax the muscles and pull the strap. As you progress, try holding the ball without the strap. Features include four balls of different weights: two pink at 27g and two black at 15g, and they are magnetic.