US DuPont bristles: Made with DuPont bristles, which are the highest quality in the industry, with better elasticity and toughness, not easy to deform and more durable. Toothbrush Head Compatible with oral b Pro series, Smart series, Genius series, Kids series professional care series, oral-b triumph series, oral b trizone series, oral-b advancepower series, oral b vitality precision clean, oral b vitality sensitive, oral b vitality white + clean, oral-b vitality dual clean, except for Oral b Pulsonic and IO.