Our replacement brush heads are made for filament, which has been recognized as the best quality in the synthetic oral care filament industry for over 70 years. The bristles are made of American Thynex nylon. Rounded brush heads for gum health are the reliable choice for gentle, gum-friendly, and effective brushing, as well as oral health benefits. Innovative round head, 360-degree full coverage of teeth in a cup shape, small and compact, deep cleaning and gum care High-density bristles adopt irregular hole bristle planting technology, the number of bristles is increased by 40%, and the cleaning of stubborn dirt is more effective You need to replace the brush head. Generally, we recommend replacing it at least every 3 months. Material: Plastic + Nylon Bristles Color: White Package Contents: 8 Electric Toothbrush Heads Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the real thing. The allowable measurement error is +/- 1-3 cm.