【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】: Easily snaps on for convenient replacementDirectly dial out and insert and you can use it. 【Specially Designed】:This head is specially designed for compatible with Philips one by sonicare toothbrush model HY1100 HY1200 BH1022 Better matching and more thorough cleaning. It was made with the best quality material. High density soft and end-rounded bristle with can perfectly protect the teeth.