Fretures:PREMIUM MATERIAL: The bristles are made of super soft nylon for easy gums cleaning. Under normal use, it is recommended that you replace the brush head every three months.Easy to replace: Just pull out the old brush head and snaps the new brush head on for easy and smoothly installation. It is easy to install and disassemble.Round-head bristles design: This electric toothbrush head is designed with round-head bristles to achieve excellent cleaning results.Multifunctional: The compact toothbrush head can clean teeth flexibly. The bristles around the toothbrush are soft and fine, and can clean your teeth gently. The high-density bristles in the center of the toothbrush help whiten your teeth.This electric toothbrush head is compatible with SB-17A. Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Material: PP Size: 7.2* 1.4*2cm Include:4 xElectric Toothbrush ReplacementHeads