Oral-B Soft Thin Bristle Replacement Brush Heads, Pack of 4 Brand New, Unopened, Domestic Genuine Product Soft Thin Bristle Brush Amazingly Gentle Cleaning ○ X-Filaments X-shaped special bristles scrape away dirt from small areas that regular bristles can't reach. ○ Soft, Ultra-Fine Bristles Ultra-fine bristles with a tip diameter of 0.01mm are gentle on the gums and provide excellent plaque removal. 99.7% More Plaque Removal* The ultra-fine, soft bristles provide excellent plaque removal while protecting the gums. The soft, ultra-fine bristles have rounded tips that are gentle on the gums and thoroughly clean hard-to-reach areas. Compatible with all Braun Oral-B rotating electric toothbrush handles.