Made with Dupont Tynex Nylon Bristles : Futulkyus sonicare toothbrush heads are all made with high quality health and safety Dupont materials. The bristles shaping fully adapts to the shape of your teeth and gums, covering more tooth surface. Densely bristles with power vibration remove up to 8x more plaques than a manual brush heads <br> Indicator Bristles : The blue indicator bristles will fade in color to let you know when it is time to replace your brush head <br> Easy Installation : Easily and smoothly snap on install <br> Hygienic cap Caps : All replacement brush heads come with an individual hygienic cap,convenient to carry for business trip or traveling <br> Great Value 10 Packs : Suitable for family use <br> Futulkyus replacement heads are compatible with Philips Sonicare electric toothbrush handles( All SNAP-ON) <br>