Colored Grout Markers are great for concealing imperfections or Can give your colored grout a brand new look Each colored grout marker covers approximately 175 lineal feet of average grout lines The tip is reversible! Remove the tip when worn, reverse it, and reinsert it into the marker Refresh your floors, countertops, showers and walls The SKM Grout-Aide Marker allows you to easily refresh or change the color of grout. The grout marker is an odorless, non-toxic, fast-drying, water-resistant, and non-bleaching sealer and colorant.