Fiber tip, waterproof and quick-drying, not easy to fade; Anti-mildew, waterproof, moisture-proof, anti-dirty; Suitable for blackened tile gaps, blackened corners and gaps, material gaps falling off, etc. Anti-bacterial formula helps keep mold from returning Shell material: plastic Range of use: Mainly used for tile gaps repair Writing line width is about 2.2~2.8mm Pen head: round head 3.0mm, plus one more oblique head can be replaced, writing line width 6mm