Features: 1. Perfect Compatibility: MOFELE toothbrush replacment heads are perfectly compatible with Oral b iO series 3/4/5/6/7/8/9/10, for Gentle Care, Ultimate Clean, Ultimate White clean Gentle and Effective Cleaning: MOFELE io toothbrush head is made of high quality bristles with 1.5 times the number of bristles planted. Removes up to 100% of plaque compared to regular manual toothbrushes 2. Rounded Brush Head Design: Rounded toothbrush head inspired by professional doctor's advice to clean teeth one by one. Bristles of varying lengths are designed for optimal tooth coverage 3. .