Colour Black Material Nylon Age range () Adult Highly CompatibleOur toothbrush replacement heads compatible with FW-507 or 508 or 515 or 551 or 917 or 959 or 2011, FW-D1 or FW-D3 or FW-D7 or FW-D8, most Seago series, ATMOKO HP126A, Dnsly TB-5. They are NOT compatible with Fairywill FW-E11 or FW-P11 or FW-P80, and NOT for kids toothbrushes. Excellent Quality Replaceable Brush HeadMade of high-quality ABS or TPE material, DuPont nylon. Removes more stains and plaque than a manual toothbrush for better gum health. The bristles are medium-soft with rounded tips. Perfect clean your teeth and protect gums. 3D Tailoring and Three-Dimensional Clean30 percent more bristles than ordinary toothbrushes, the W-shaped bristles perfectly fit the teeth and clean the areas that are difficult to reach with the ordinary brush head. Dentists SuggestReplacing the toothbrush head at least every 3 months to avoid exceeding the breed of bacteria. Ten replacement brush heads for long-lasting use. Easy to UseTurn left to install, turn right to detach, easy to replace, without any additional auxiliary means. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.