Perfect compatibility with all Oral B Braun toothbrushes, except Oral-B Pulsonic and iO Precision replacement brush heads for superior daily cleaning Durable Dupont bristles from the United States for increased elasticity and hardness Excellent cleaning effect with slightly longer bristles to reach the blind spot in the oral cavity Safe and reliable, protects gums and enamel Great value pack with 16 precision brushes for several months Color recognition for easy identification Regular replacement recommended by dentists every three months