A. Specification: - Type: Replacement Toothbrush Heads - Suitable For: Philips - Age: Adult - Material Composition: ABS Plastic + DuPont Bristles + 304 Stainless Steel B. Comfortable and Durable: The genuine DuPont bristles can provide a difference. They can care for teeth and gums, offer a deep cleaning, and remove about 7 times more plaque than a manual toothbrush. C. Independent Packaging & Hygienic Cover: Each toothbrush head is independently sealed - packed and comes with a dust cover cap, which is quite hygienic. You can share it with friends and take it when traveling. D. Screw - on system fits: Advance, CleanCare, Elite, Essence and Xtreme Brush Handles. As long as there is an e - series, it can be used. It is suitable for common Philips models: - HX5 series: HX5100/HX5251/HX5451/HX5581/HX5751 - HX7 series: HX7001/HX7351/HX7361/HX7551/HX7553 - HX9 series: HX9552/HX9553/HX9842/HX9882 - Other series: Advance e - 4000/Essence e - 5000/Elite e7000/e9000/Xtreme e3000/E and X series E. Package Included: 1Pc or 2Pcs or 4Pcs x Replacement Toothbrush Heads F. Note: - Please allow a 1 - 3 cm measuring deviation due to manual measurement. (1 inch = 2.54 cm) - Due to different monitors and light effects, the actual color of the item might be slightly different from the color shown in the pictures. Thank you.