America's best-selling mechanical marking pencil. Strong, thick wax base lead for big, bold marking. Writes on metal, wood, glass, plastics, paper — almost any surface imaginable. Wipes off with cloth or tissue.This marker, commonly referred to as a grease or china marker, will write on just about any surface, even under water. It will wipe off of any slick, non-porous surface, such as glass, with a dry cloth. It is completely non-toxic, making it safe for use around food. Its uses are endless. Its industries are numerous.