The Fun Factory B Ball Uno is a silicone anal plug with an internal ball that moves with the users movements to provide additional stimulation. It is gray and black. Instructions for use The Fun Factory B Ball Uno is an anal plug with an internal ball that moves with your body, providing extra stimulation. Its inserted into the anus, allowing you to enjoy the sensations it creates as it moves. Remember to always use water-based lubricant for a more comfortable experience. Who is it for? The Fun Factory B Ball Uno is designed for people who want to experience new and pleasurable sensations during sexual stimulation. Pharmaceutical advice At farmaciasdirect we recommend that you read the instructions before using this product, especially if you suffer from any condition or allergy to any of its components. If you have any questions, you can contact us through the pharmacy advice service available on our website so that one of our experts can advise you as best as possible.