SEAGO Replacement Toothbrush Head Fit S2/S5/SE-6/SK2/972/S2X Dupont Soft Bristles Toothbrush Nozzles SG851 Electric Brush Head *Note: Non-original, High quality replacement toothbrush head. Features: Wide Compatibility: Compatible with fairywill electric toothbrush SE-6/SK2/S2X/SG851/S2/S5/S10/SE-6/SG972 Sanitary Packed: Each replacement head equipped with dust cover then sealed into plastic bag and together packed in paper box. Three layers of protection avoid dust pollution during packing and transportation. Also, dust cover is perfect for travel, keeping your head free from germs & stains. w"Shape Bristle: Shape of bristle is designed in W"shape thus the head can fit to your teeth well. A great shape for efficiently brush and removing more plaque and stains. Teeth Protection: 95%-98% top of bristle rounded before packaging. Just considering protecting your teeth when brushing in high vibration. The teeth enamel would get worn if bristle was not rounded. Easy to Install: Contra-rotate to take out old head and clockwise rotation for refilling new one, easy replacement.