For Xiaomi SOOCAS X3 X5 X3U X1 V1 V2 SOOCARE Electric Toothbrush Heads Foodgrade Bristle Replacement Tooth Brush Head Nozzles with Anti-dust Cap Product Introduction: 1 replacement brush head is made of yunchi Brand ,it is Compatible with SOOCARE X1 X3 X3U X5 sonic electric toothbrush. 2. Every brush head is sterilized by way of UV tender before packing. Each package is independently sealed, with anti-dust cover. 3 Dupont bristle , with ease deep cleansing tooth.