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: NOT FIT Fairywill E11/ 2001/ 2081/2205/2209/921) DUPONT QUALITY BRISTLES: The bristles are made of DUPONT nylon, which is a professional high-quality brush material for toothbrush heads. The bristles are just right between soft and hard, ideal for cleaning around sensitive areas and fighting food debris and plaque! EFFECTIVE AND CLEAN: W-shaped bristles are designed to fit well with the teeth's topography to ensure the brush heads reach every area and clean the gums thoroughly and remove hidden plaque easily! The reminder bristles fade to let you know when it's time for a replacement. END-ROUNDED BRISTLES: The ends of the bristles are rounded through a polishing process for safety and gentleness. So your gums are protected. Replacement heads are extra gentle and comfortable for your teeth and gums than ordinary replacement brush heads. High reliability in brush planting to ensure that the bristles do not fall off. AFFORDABLE PURCHASE: 10x replacement brush heads vacuum-packed at an unbeatable price. Dentists recommend changing your toothbrush head at least every three months. Our replacement brushes will last for months or even years. It is suitable as a gift for your family and friends.