THE WONDERS OF WRITING ON GLASS Make your windows, mirrors and glass surfaces works of art. Rainy Dayz Gel Crayons draws vibrant and bold colors on glass surfaces... and paper too. And for an extra special touch use a wet paintbrush to add amazing watercolor effects too. Comes in 12 bright colors and cleans off easily. 12 Vibrant Colors Writes on Glass, Windows, Mirrors and Paper Watercolor Effects