4 years & up. Draw with bright colors on any glass or mirror surfaces with these exciting Crayola® Easy to Wash Off Window Crayons for Glass Surfaces. These window crayons don?t smudge and dries instantly. When children are finished creating unique art masterpieces, the crayons wash off with a damp cloth. These crayons promote fine motor skills, creativity, imagination, and color recognition. Assorted colors: blue, green, black, red, and yellow.