The Gold Ball Keigal Muscle Marbles are two independent metallic spheres intended for insertion and retention within the vagina. Insert one or both of these balls and squeeze and retain them using the famed Keigal muscles. Over time you will find that the stronger your Keigal muscles become the better grip they can have on penises, vibrators and just about anything else they come into contact with.
Why is it necessary that your vaginal walls have such strength? Simply put, because the stronger your muscles are the better sex can feel for you and for your partner...and that is never a bad thing.