Highly compatibleOur toothbrush replacement heads are 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. Excellent quality replaceable brush headMade of high quality ABS/TPE material, soft nylon. Removes more stains and plaque than a manual toothbrush for better gum health. The bristles are moderately soft with rounded tips. Clean your teeth perfectly and protect your gums. 3D Tailoring & Three-Dimensional Clean30% more bristles than ordinary toothbrushes, W-shaped bristles fit teeth perfectly and clean areas that are hard to reach with the regular brush head. Suggestions from DentistsReplace the toothbrush head at least every 3 months to avoid overtaking the breed of bacteria. Ten replacement brush heads for durable use. Easy to useTurn left to install, turn right to detach, easy to replace, without any additional auxiliary means.