The waterproof grout marker repair pen is designed to instantly stain and cover stained, dirty or old grout. Refresh all your bathrooms, kitchen surfaces, tile floors, countertops or walls. It restores the grout to its al color and makes your home look like the day it was built. You can also change the color of the grout by covering up stubborn grout stains. It is eco-friendly because it is scientifically designed to be odorless, non-toxic, and safe for your family and pets. It has faster and easier application on straight grout lines to cover mold, mildew and stubborn stains, and it also helps prevent further molding of its antimicrobial material. Size: 140mm Line width: 2.0mm Features: Water and light fastness, quick drying and colorfastness Keep ink colors bright and strong. Scope of application: suitable for tiles and marble floors Inadvertent scratches and stains are filled and repaired. Package content: 2 tile beauty sewing pens