HX3013. Fits only PowerUp battery toothbrush. Reminder bristles fade when a replacement is needed. Dentists recommend replacement every 3 months for optimal results. No. 1 recommended brand by dental professionals. Fits only PowerUP battery toothbrush. For all questions, call: 1-800-682-7664. Recyclable packaging material. www.philips.com/sonicare. Made in China.