Joyballs secret these are some chinese balls for effective training of the pelvic floor muscles through the innovative trampoline effect (vibrations of the inner sphere). made of silicomed that does not irritate the muscles, hypoallergenic, waterproof and easy to clean when you can even wash it in the dishwasher. the chinese balls offer: more pleasure during sexual intercourse. as an effective method for postpartum uterine involution. for the prevention of incontinence. improves control of the muscles in the genital area. contains an extraction ring that remains in the body. it is recommended to use water-based lubricant for this product