[【Specially Designed】:This head is specially designed compatible with Colgate Hum Connected Smart Battery Toothbrush Refill Head.Unique design without inner plug devicestronger 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. Also dust cover is perfect for travel. 【Wide Compatibility】: Fits on all hum toothbrushesEasy to Install. 【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. 【High cost performance】: A box of 12 pieces can meet your need to change your toothbrush and the price is more appropriate.]