【Specially Designed】:This head is specially designed.Unique design,more dense bristles，stronger vibration and more thorough cleaning. 【Sanitary Packed】: Each toothbrush 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. 【Teeth Protection】: 95%-98% top of bristle rounded before packaging. Just considering protecting teeth when brushing in high vibration. The teeth enamel would get worn if bristle was not rounded. 【"w" Shape Bristle】: Shape of bristle is designed in "W" shape thus the head can fit to your teeth well. 【High cost performance】: A box of 10 pieces can meet your need to change your toothbrush, and the price is more appropriate.