FULL COMPATIBILITY: Compatible with FW507/508/515/551/917/959/D7/D8/D3/D1/2011; Compatible with SG E9/507/515/575/909/917/949/958/908/610/659/719/910; Compatible with HP126A/HP150A; Compatible with Dnsly TB5; Compatible with Fairywill/Sboly/ATMOKO/Teeteck. (NOTE: Does NOT fit Fairywill E11/2001/2081/2205/2209/921) DUPONT QUALITY BRISTLES: The bristles are made of DUPONT nylon, a professional high-quality bristle material for toothbrush heads. The bristles are just right between soft and hard, ideal for cleaning around sensitive areas and combating food particles and plaque! EFFECTIVE AND CLEAN: W-shaped bristles designed to fit well with the topography of your teeth to ensure the toothbrush heads reach all areas for thorough gum cleaning and easily remove hidden plaque! The reminder bristles fade to let you know when it's time for replacement. ROUNDED BRISTLE TIPS: The bristle tips are rounded through a polishing process for safety and gentleness. So your gums are protected. The replacement heads are extra gentle and comfortable on teeth and gums than regular replacement brush heads. High reliability of bristle planting to ensure the bristles don't fall out. VALUE PACK: 10x replacement brush heads with vacuum packaging at an unbeatable price. Dentists recommend replacing your toothbrush head at least every three months. Our replacement brushes last for months or even years. It makes a great gift for your family and friends.