Genuine Philips Sonicare rechargeable electric toothbrush replacement heads compatible with all Philips Sonicare click-on rechargeable toothbrush handlesNumber one recommended power toothbrush brand by Dental ProfessionalsUp to 6x more plaque removal versus a manual toothbrushPower Tip targets plaque along the gum line. Size: Standard, Bristle stiffness: MediumBrushSync mode-pairing and replacement reminders when used with a BrushSync compatible handle (DiamondClean Smart or ProtectiveClean)