This U.S. industry comprises establishments primarily engaged in manufacturing pens, ballpoint pen refills and cartridges, mechanical pencils, and felt tipped markers. Manufacturing nonmechanical pencils and pencil leads--are classified in U.S. Industry 339942, Lead Pencil and Art Good Manufacturing; Manufacturing writing, drawing, and india inks--are classified in U.S. Industry 325998, All Other Miscellaneous Chemical Product and Preparation Manufacturing; and Manufacturing rubber erasers--are classified in U.S. Industry 326299, All Other Rubber Product Manufacturing.