SMARTBALLS DUO and SMARTBALL UNO make it possible to train the pelvic floor muscles in a fun and effective way. During everyday activities the SMARTBALLS train the sensitivity of the inner musculature, strengthening the pelvic floor muscle. An ergonomically shaped EASY IN-finger hollow and a conically tapered ball make insertion easy. SMARTBALLS is extremely quiet, smooth running and the steady and intense rolling motion of the inner balls has been developed by some very innovative technology. The silicone used for SMARTBALLS is gentle to the body, hypo-allergenic and velvety soft.