Fast drying, grout pens will cover stained seams between tiles and renew the after painting,strong covering power. You only need to apply the ink where you need it to get the perfect color after repair,leaves them looking clean and protected. The is made of water-based ink that is environmental, waterproof, anti-moist,anti-dirty and quick dry.Soft pen tip allows a smooth flow,safe for children and pets. Easy to Use Just 3 steps: 1.shake the pen,2.Press the tip for removing the gas,3.press down several times, the ink can be written. Best for Home Sink, Kitchen,Bathroom and any other room that has floor or ceiling tiles. for the beautification of wall and floor tile gaps, renovation, ceramic tile space fall off. Weight: 21G Line width: 2MM Applicable scene: Filling the gaps between tiles..... Features: waterproof, quick-drying, non-fading, strong covering power Colour: as shown Material: ABS Package Contents: 8 * Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.