For SOOCAS X3/X3U/X5/X3Pro/X1 Replacement Toothbrush Heads Sonic Electric Tooth Brush Nozzle Heads Smart Brush Heads With CapsNOTES:Suitable for SOOCAS X3Pro/ X3U/X1/X3/X5/V1/V2/V5/D3/D2 Electric ToothbrushFeatures:1. Soft DuPont bristles, compatible for sensitive tooth to use 2. Ultrasonic electrical toothbrush can efficiently get rid of plaque and reduce gingival necrosis. 3. Adopt DuPont American tynex basic zero bristles bristles,gently in your teeth. 4 bristle tip diameter, deep clear the distance between enamel five authorised via FDA and UV sterilized. 6 sealed packing, way more secure to use. 7 replace the toothbrush heads each three months 8 you've any questions on the toothbrush model, you have to search the advice of visitor service. Thank you.