You don't have to wait until winter to get a beautiful frosty pattern on your windows. Surprise everyone with ice crystals and snowflakes when the sun is blazing. Simply draw them on with Crayola Crystal Effects Window Markers - they work with solar energy. Non-toxic Crystal Effects Window Markers flow on easily and they're simple to remove with water when you want to change your artwork. Each pack includes 8 Crayola Washable Crystal Effects Window Markers - 7 jewel-like colors and white.