The Fun Factory Smartball Uno Kegel ball - also known as a jiggle ball - is made with velvety soft silicone right down to the removal loop, which means it is easy to clean and very skin safe. Designed for Kegel exercise beginners, the Smartball Uno is perfect for women with a dropped or tilted uterus. The Smartball Uno has been updated with a cleverly designed tapered head, making insertion much easier and improving overall comfort. The movement of the ball within the vagina causes the pelvic floor muscles to tense and relax, which strengthens them over time, making them tighter and more toned. Unlike some other similar products on the market, the Smartball Uno is quiet when in use. Although the Smartball Uno is not primarily a sex toy, continued use of jiggle balls in a Kegel exercise regime can lead to improved arousal, stronger orgasms and strengthened pelvic floor muscles: ideal for those with health conditions such as bladder weakness.