Chinese balls are hollow spheres that contain heavy marbles. Once inserted, the natural movement of the body causes the balls to move inside the spheres. When you are done using them, they are easily removed thanks to the safety buckle. They are designed to strengthen the muscles in your vagina. They can also reduce the risk of incontinence and help regenerate the vagina after childbirth. The K Balls also promise a lot of pleasure by causing intense sensations in the hollow of the vagina.