This set comes with a removable sleeve that holds both weighted balls. As you wear this set, the kegel balls offer stimulating sensations as the inner weights roll freely inside the balls! This set is perfect for any woman who wants a tighter, toned pelvic floor! You'll love the difference you feel as your muscles strengthen after you've started regularly practicing kegel exercises with these balls! They will improve your sexual drive and satisfaction providing more explosive orgasms, enhance your partners sensation as they feel you squeeze your tighter vaginal walls, and they help women who have lost pelvic definition due to aging or childbirth. In addition, tighter pelvic muscles offer greater urinary control! The improvements seems endless with this set of kegel balls.