Colour Black Material Nylon Age range (description) Adult Highly CompatibleOur toothbrush replacement heads compatible with FW-507/508/515/551/917/959/2011, FW-D1/FW-D3/FW-D7/FW-D8, most Seago series, ATMOKO HP126A, Dnsly TB-5. They are NOT compatible with Fairywill FW-E11/FW-P11/FW-P80, and NOT for kids toothbrushes. Excellent Quality Replaceable Brush HeadMade of high-quality ABS/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 & Three-Dimensional Clean30% 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.