Make sure your Oral-B iO series electronic toothbrush is working as hard as it can with these replacement brush heads. These replacement brush heads feature a round brush head design that helps to give your teeth a professional clean feeling with every use. With tufted bristles, these brush heads get into hard-to-reach spaces, for a clean you can truly feel. | Oral-B iO Series Ultimate Clean Replacement Brush Heads (iO RB CB-2) - 2 Pack - Black