For many reasons: 1. For retrieval loops or similar, a coating with softer material such as silicone is necessary, which significantly reduces the intensity of the stimulation. The priority of Viball love balls is to achieve the maximum possible efficiency. Implant steel conducts oscillations and vibrations into the body in an unsurpassable way, remains permanently hygienic, is completely free of toxins, extremely sustainable and environmentally friendly.
2. The very smooth surface of Viball stimulates the muscles to feel the ball, to move it, to play with it, so to speak. This happens involuntarily and without your intervention. Viball gradually moves over different parts of the muscles instead of remaining in one place. This is an essential part of its effect. Any kind of external application or change in the shape of the ball prevents this therapeutic and also pleasant effect. 3. Any mix of materials is anatomically and hygienically questionable, especially when used rectally. The closed stainless steel ball is smoother, considerably more efficient and easier to clean and insert than plastics. 4. Viball is completely absorbed by the body, there is no bridge for bacteria to get into the inside of your vagina, which can cause vaginal yeast infections, urinary tract infections, etc. This makes Viball completely invisible to others, and you can use it wherever and whenever you want. Balls with chains are more commonly used in the BDSM/fetish area: The chains are either attached to protruding eyelets on the surface of the ball, which cause problems when inserting and removing, or they are attached with a screw that protrudes into the inside of the ball and makes it impossible for the inner ball to roll freely. Because of the thread, the outer balls have to be very thick-walled, which means the inner ball has less space and the effectiveness is reduced even further. In addition, this hole in the outer ball is a hygiene concern because the interior cannot be cleaned.