There are 4 color rings to distinguish them and allow you to pick up your brush head so that you can share it with your family. Genkent brush head is compatible with Oral-B electric toothbrush models (including Vitality Precision Clean, Professional Care, Triumph, White + Clean, Advance Power, Sensitive and Dual Clean Series) except Vitality Sonic, Sonic Complete, Pulsonic, CrossAction Power, and iO.