SMARTBALLS teneo duo is a convincing unit combining functionality, ergonomics, quality and design. The vaginal balls help strengthen the pelvic floor musculature. The easy in finger hollow makes insertion easy. The vibrations of the balls train the pelvic floor muscles discreetly, easily and effectively. SMARTBALLS teneo duo is poured from one cast of medical standard, body compatible silicone. The interior balls rotate with an innovative, quick technique that is steady and above all quiet. The special surface structure enhances the toys hold.