The Fun Factory Smartballs playfully get your pelvic muscles in shape. The velvety and sleek Smartballs Teneo Uno is perfect for beginners and for those with a dropped or tilted uterus. The ridges on the ball add sensation, while the inner ball rotates quietly in response to movement, making kegel exercises fun and stimulating. The ergonomically-formed finger hollow on the base makes insertion easy, while the silicone removal loop allows for effortless removal. 1 1/2" in diameter.