FAMILY PACKAGE - Our package contains 8 Bimily Replacement toothbrush heads with 8 colored rings. Please change the toothbrushes every 2-3 months or early in order to achieve an optimal cleaning performance. COLORED RINGS FOR IDENTIFICATION - Our toothbrush heads are easy to install with just one click. In addition, each attachment has removable colored rings for identification. ERGONOMIC DESIGN - The round toothbrush heads adapt comfortably to the contours of the teeth, the End-rounded bristles clean the tooth surface intensively and effectively remove plaque. HIGHT COMPATIBLE – Our replacement toothbrush heads are compatible with all Oral B electric toothbrushes, e.B.Oral-B Cross, Oral-B Triumph, Oral-B-SmartSeries, Oral-B Sensitive, Oral-B 3D White, Oral-B TriZone, and Oral-B Vitality, (except Vitality Sonic), Oral-B Dual Clean and More models. But NOT compatible with Oral b Pulsonic toothbrushes and Oral B iO. EFFECTIVE DEEP CLEANING - The short bristles for cleaning the tooth surface, long bristles get deep into the difficult accessible spaces between the teeth and brush the teeth clean, thereby keep the oral system healthy.