These are replacement brush heads designed for the Oral-B iO series electric toothbrushes. The Ultimate Clean black heads feature unique polishing cups and optimally angled bristles engineered to provide a superior cleaning experience, effectively removing up to 100% more plaque compared to a regular manual toothbrush. Ideal for daily oral hygiene maintenance, this accessory ensures you maintain peak performance from your electric toothbrush. Replace your brush head regularly to ensure continued effectiveness against plaque buildup and gum health maintenance.