A soft bristle with tip is less than 0.01mm Bacteria Inhibited Bristles Reduces bacterial growth on bristles by 99%^ ^Based on test results about Colon Bacillus and Staphylococcus Aureus, proven effectively reduce bacteria growth on bristles by 99%. (Data provided by H&H R&D) Dual-Ring Brush Head New dual-ring compact head design for deep cleansing of inner oral cavity. Ergonomic Handle Unique handle design that closely fits hand shape with anti-slip indentation for easier and more comfortable grabbing. Charcoal Gold 0.01 Slim Tip Soft